Sample Question by Students of Class ZCT 104
By noor
sawana sabaruddin (79172)
I.
Relativistic mass is not an invariant quantity but rather is dependent on the
particle*s speed. (correct)
II.
A particle*s relativistic mass decreases with speed. (false)
III.
Proper time is not dependent on the choice of inertial frame. (false)
IV.
Classical law of momentum conservation is invariant under a Galilean
transformation. (true)
A. a B. a,b
C. a,b,c D
a,b,c,d E non of the above.
Answer :
DIY (Comment: doesn*t sound authentic to
me lah)
I.
Galilean transformation is valid on classical laws Newtonian mechanics. (true)
II.
Hubungan di antara momentum klasik dan momentum relativity tidak boleh
dikaitkan di antara satu sama lain secara matematik. (false)
III.
All conservational laws in physics are invariant under Galilean transformation.
(false)
IV.
The expression of classical definition of momentum is invariant under Lorentz
transformation. (false)
A.
I B. I,II
C. II, III, IV D. I,IV E. non on the
above.
answer :
DIY
reason.
~ mmtum klasik dan relativity BOLEH di hubungkan
antara satu sama lain.
~
G.T hanya teraplikasi dlm Huk. MEKANIK shj, tetapi
L.T teraplikasi dlm semua hukum FIZIK.
~
(Comment: doesn*t sound authentic to me
lah)
A.X*s
B.Y*s C. both X and Y*s claim are
equally valid D.
non of the above.
ANS:
B and A. their are equally valid because simultaneity
is NOT an absolute concept but a relative one, depends on the state of motion.
By noor masdiana bte md.said
I. The time interval
between events that take place in the same position in one of the frames.
II. Whether two events occurring
at different locations in both frame are simultaneous.
III. Their relative speed of motion v with respect to each other.
IV. The simultaneity of two events
which take place at the same position and time in some frame
A.
I,II,III B.
I,IV C.
III,IV D.
I, II E.
IV
A.
L B.
2L
C.L/2
D.4L E. none of the
above
answer :
DIY
By Chan Tang Yoong
(81824)
I.
The
rate of time flow plane N is the same as that in plane (S), but is slower than
that in plane (W).
II. All
the 4 planes have the same rate of time flow.
III. The
plane W have the slowest rate of time flow.
IV. The
plane E has the slowest rare of time flow.
A.
I,IV. B.
II. C. III. D.I. E. Non of the above.
Answer :
DIY
(Comment: doesn*t sound authentic
to me lah. Looks like it is copied from somewhere#)
A.0.60c B.0.57c
C.0.58c D.0.55c E.0.56c
(Comment: doesn*t sound authentic
to me lah. Looks like it is copied from somewhere#)
By lim kok yong (
82441/04 ), loh chon foong ( 82454/04 ), tong kim suan (
82762/04 )
A)
m0< m1< m2 B)
m2< m1< m0 C)
m0< m2= m1 D)
m1= m2 <m0 E)
tiada jawapan di atas
Answer :
DIY
1)
cahaya yang berkeamatan tinggi akan menyebabkan tenaga
kinetik elektron bertambah.
2)
tenaga adalah selanjar dan tidak boleh dibelah.
3)
cahaya ialah gelombang dan tidak mengandungi tenaga
diskrit.
4)
apabila cahaya membekalkan tenaga kepada elektron,
masa diperlukan untuk elektron
disingkirkan.
A) 1 dan 2
B)
2 dan 3
C)
3 dan 4
D) 3 sahaja
E) tiada jawapan
Answer :
DIY
A)
7.74*10-5 eV Hz
B)
5.81*10 14 Hz
C)
9.98*10-5 eV Hz
D)
4.84*10 14 Hz
E)
tiada jawapan
Answer : DIY
(Comment: doesn*t sound authentic to me lah. Looks like it is copied
from somewhere#)
I) tenaga foton cahaya bertambah.
II)
fotoarus bertambah.
III)
tenaga kinetik maksimun fotoelektron bertambah.
IV)
tenaga foton cahaya tidak berubah.
A) I, II dan III
sahaja
B) II
sahaja
C) II dan III
sahaja
D) II dan IV
sahaja
E) tiada jawapan
Answer :
DIY
(Comment: doesn*t sound authentic to me lah. Looks like it is copied
from somewhere#)
1)
tenaga satu foton tidak dipengaruhi oleh keamatannya.
2)
laju fotoelektron bertambah apabila keamatan sinaran
bertambah.
3)
fotoelektron tidak semesti tidak akan disingkirkan,
apabila keamatan cahaya adalah rendah.
4)
fotoelektron bergerak lebih laju jika disinari cahaya
yang frekuensi lebih rendah daripada frekuensi ambang.
A) 1 sahaja B) 2 dan 3 sahaja C)
1 dan 3 sahaja D)
1, 3 dan 4 sahaja E) tiada jawapan
Answer :
DIY
Authentic question by 1. Hadijah
Awang Mahmud ( 52488/99 ), 2. Masitah Wahidon ( 72084/02 ), 3. Hazura Hashim ( 72060/02
), 4. Sharifah Nurah Sayed Dol Islam ( 58861/00)
( Syarat-syarat
minimum untuk fotoelectron-fotoelektron dikeluarkan dari permukaan logam )
i.
Kinetic energy,
Kmax >0 ( Tenaga kinetik, Kmax>0)
ii.
耒 = 耒0
iii.
耒 > 耒0
iv.
h耒≡W0
(a) I, II & IV
(b) I & III
(c) II & IV
(d) None of above
Answer : B (YTL*s comment. This question is
authentic judging from the fact that i have not seen them before. I would like
to comment on the option i: The requirement of Kmax > 0 is not a requirement
to get the electron kicked out from the surface, but a consequence. Also,
option III and option IV are actually equivalent statements. Option II is a bit
ambiguous to be an &yes* because u r asking for
&minimal requirement*. So I am not really sure if option II should be taken as
yes or no. in any case, my answer to this question is III and IV. I think
option II should be replaced by some other non-ambiguous statement to avoid confusion )
By noor sawana sabaruddin (79172)
a. the higher the frequency give smaller the quantum of
energy. (I suppose u mean ※the higher the
frequency of the light, the smaller the quantum energy of a photon is§)
b. the frequency of black body radiation radiated
is increased accordingly when the quantum gaps between the oscillators
increases (I have reinterpret yr original
statement #)
c. A blackbody has only a finite amount of energy
so it can produces an extremely high ' f ' quantum jump. (aiyo#don*t
know how to reinterpret or correct this statement lah#So actually I am also not
sure if this statement actually makes sense or not.)
d. the energy of macroscopic scale seems to vary
continuously (this statement is correct)
A a,b B
c,d C a,c
,d D
b,c,d E b,d
Ans. E reason :BB
cannot supply to produce an extremely ' F '. the
higher ' f ' give the higher quantum
15. What of the related between photoelectric(PE)
and Compton Effect(CE)?
a. PE can behave
as a particle and CE exhibit wavelike behavior.
b. The CE is
change in wavelength of high energy EM radiation when the scatter off electron
c. X-ray energy
scale involved is much higher than PE
d. a photon give up part of its energy in CE, but
in PE photon give up all of its energy to electron (this is a correct
statement)
A a,b B
b,c C a, c,
d
D a,b,d
E b,c,d
(YTL*s
comment: this question is not well asked. For a, one cannot says PE or CE behaves
like wave or particle, because they are experiments. How could an experiments behave like wave or particle? In b, you
should say: ※in CE, the high energy EM radiation would change in its wavelength
when scattered off by an electron. This is a correct statement.§
Statement c appeared ambiguous. The correct statement
is ※the energy scale of an x-ray photon is similar or higher than the energy
scale involved in a typical PE experiment.§ The energy scale in aCE corresponds
to the equivalence of the
16. What*s the most important significance of the Compton
Effect experiment?
a. To confirm that the energy of the quantum of light is
proportional to the frequency of the wave model of light (Nop. Despite a correct
statement, it is not the most important significance of the
b. To confirm that the radiant energy of light is
quantized into concentrated bundle (Nop.
Despite a correct statement, it is not
the most important significance of the
c. To confirm that EM radiation has both wave and
particle properties (nop. The correct
statement is ※To confirm that EM radiation has particle properties§)
d. To confirm that the X-ray energy is transferred from
photon to Kinetic energy of electron (err#this
is a correct statement but not the most important significance of the
17. What is (are) the correct statement(s) about X-ray?
a. Part or all of the kinetic energy of the moving
electron is converted into X ray photon (true)
b. electromagnetic radiation is emitted when free
electrons absorb part of the photon energy (false
statement. Free electron can*t absorb photon*s energy by itself)
c. the production of x ray can be considered as a
photoelectric process (incorrect)
d. The shortest wavelength in the x-ray spectrum is the
same for different material (true).
A. a,b B. b,c,d,
C. a,c,d
D. a,c
E. none from above
By Noor masdiana bte md.said(mas),
83762
(a)
Rayleigh-Jeans law is reasonable at short wavelengths (you should replace &reasonable* by &behaving physically* to make the
meaning of this
option less ambiguous)
(b)
Rigel (the blue star) is hotter than Betelguese
(red star) because of the position of the peak wavelength in their black body
spectrum
(c)
According to Rayleigh-Jeans law the average energy is given by the
equipartition theorem
(d)Based
on experimental data, the probability of excitation in the oscillator in a
blackbody is low at short wavelengths
A.
a and
b
C. a B.
none of the
above
D. b, c and d
ANS:
DIY
(a)
We conclude that light to behave like a wave when we find that the light from
the sun arrives to the Earth after 8 minutes it was emitted. (err#nop. .Logically we cant make such conclusion
based on this observation. )
(b)
When we consider light to behave like a particle there is a time lag for the
electron being emitted from the surface of the metal in a PE experiment. (this is an false statement. If we consider light
as particle there would be almost no time lag.)
(c)
Photoelectricity occurs at the same energy scale because the process to produce
X rays is just inverse process of photelectricity (this statement appeared ambiguous. It should
be corrected to ※Photoelectricity occurs at the same energy scale as the x-ray
production because X rays production is the inverse of the photelectricity
process§. This is a false statement.)
(d)
X rays is affected by electric and magnetic fields. (this is a false
statment)
A.
c and
d
C. a,b,c and d B.
a and
b
D. a
ANS:
DIY
By
Norhidaya binti Zakaria, 74483/3
I)The
energy level of the electrons in atomic orbit is quantized (this is a correct statement)
II)The energy state is negative because it is not a bounded
system (this is a false statement. Energy
state negative means its is a bounded system.)
III)E=0 means the electron is free from the bondage of the
nucleus' potential field. (this is a correct
statement)
IV)Electron at high n is tightly bounded to the nucleus by the
EM force. (this is a false statement)
A)I,II,IV B)II,IV C)I,III,IV D)I, II, III, IV
ANS:
DIY
I)
An application of
II)
The expression for total energy (err#this
is an ambiguous statement. It has an expression of the total energy, but so
what? Any theory can supply expression of total energy. So does the expression
of the total energy an &ingredient* to the theory? So strictly speaking this is
not a correct option to this question despite being a correct statement.)
III)
the angular momentum postulate (to pose an option to the question, u got to be more specific. U got to
mention that it is quantized angular momentum postulate.)
IV)
An application of classical theory (to
make this option less ambiguous, its best be replaced
by &It assumes the validity of classical electromagnetic theory§. Then this
would make this statement unambiguously false.*)
A)I,II
B)III,IV
C)I, II,
III
D)I, II,
III,IV
ANS:
DIY
By Tan
ii.
iii. De
Broglie confirmed that the wave nature of electron in which it undergoes
Bragg*s diffraction. (its Bragg who confirm this, not de Broglie. dB
only made the postulation, not the one who confirms it. So this is a false
statement)
iv.
particle properties. (Err#the
A. I B.
i,ii,iii C.
i,iii,iv D. i,ii,iv E. not in the choices A, B, C, D
(Says
Seng Yu:) Actually I have other statements instead of
above one:
*Max Planck-developed a theory of blackbody radiation that lead to an equation
for the intension of radiation. (To be
more specific, you should ask ※Max Plan k -developed a theory of blackbody
radiation that lead to an correct equation for the intension of black-body
radiation that conforms with the experimental observation§)
*Einstein-space & time now becomes state-of-motion dependent. (correct statement)
*Michelson & Morley-They did an experiment which render untendable the
hypotesis of the ether. (this statement is taken directly from past year lah, not authentic.)
*Heisenberg-uncertainty principle shows that a particle is represented by a
wave packet/pulse. (err#this statement is a bit ambiguous. Logically
I am not sure if this statement is true or false lah. May be the
logics has to be reversed, ie. Because particle is like wave, therefore there
obey the uncertainty principle.)
*Davisson & Gremer-confirmed the wave nature of electron in which it
undergoes Bragg*s diffraction. (correct, but I suspect
this statement is again copied from past year question lah.)
*de
Broglie-particle has intrinsic wave properties. (A correct statement)
I think#this type of question require student to know the contributions of the physicist
Subjective
Why are the Thompson & Rutherford*s atomic models
cannot be accepted? (err#this is not a correct way to ask the
question. They are actually accepted once, except that there are
incompatibility between the models with experiments and/or theoretical
expectation. So one should ask the question in a more robust manner:※ Why are the
Thompson & Rutherford*s atomic models not completely acceptable?§)
Ans:
Thompson*s Plum Pudding Model was falsified by the
Rutherford
Planetary model is falsified by the infrared catastrophe. (err#it would be difficult to say that the model is falsified by the
infrared catastrophe, as the latter is only an theoretical expectation, which
may not be absolutely robust. The best one can say is that ※Rutherford
Planetary model is predicted to have infrared catastrophe, which is an unacceptable
feature to any physical theory.§ Whether one can take this statement as a valid
&falsification* to the model is subjected to argument.)
3. What is the central of quantum physics?
Ans: Aarticle & wave properties of electromagnet radiation.
(Whoops, this appear
to be an extremely oversimplifying statement.)
i. Plum-pudding model fails to explain the emission & absorption line
spectrum from atoms because it predicts only a single unique emission
frequency.
ii.
iii. Plum-pudding model cannot explain the 180 degree back-scattering of alpha
particle seen in
iv.
diffused distribution of the positive charge of an atom. (Nop. The
a. I b.
i,ii,iii c.
i,v d.
i,iii
i.
It is mechanical stability (where the Coulomb attraction is equal to
centripetal force.) (true)
ii. There is infinite orbit which is possible in classical mechanics. (false)
iii. It is only possible for an electron to move in an orbit that contains an
integral number of de Broglie wavelength. (true)
iv. An electron moving in allowed orbit does not
radiate electromagnet energy despite the fact that it is constantly
accelerating. (true)
a. i,iii,iv b.
ii,iii,iv c.
i,ii,iv d.
i,ii,iii
I)
They cannot explain the pattern of discrete spectral
lines. (true)
II)
The prediction of unique oscillation frequency in the plum pudding model is
falsified by the fact that observationally light spectra from all atoms shows
sets of discrete spectra lines correspond to many different frequencies. (true)
III)
Both*s model has the defective feature of Infrared Catastrophe. (true)
(IV)
The Rutherford scattering experiment showing large angle deflection of alpha
particle falsified both of the models proposed by Thompson & Rutherford. (this is an false statement as the experiment
only falsifies Thompson*s mode but not the
By nursyazura bt.
Khari, 74505/03
2)
Atoms are not stable. (false)
3) Atoms contain negatively charges, electrons, but are electrically neutral. (true)
4) Atoms emit and absorb EM radiation. (true)
A) 1,3 and 4 B)
1,2 and 4 C)
3 and 4 D)
Non of the above
ANS:
DIY
By Noor Syuhada Binti Mat Serat,
74458/03, industrial chemistry
I.
Energy is transferred from kinetic energy of electrons to photons in PE. (true)
II.
In X-ray production, work function of the metal surface is not approximately
ignored, whereas this is the opposite in PE. (false)
III.
Energy scale is not the same in both PE and X-ray. (true)
IV.
X-ray is an exothermic process. (Some
comment of caution: I
suppose the term exothermic is referred to processes in which
energy is released when molecules/atoms rearrange themselves in an physical
process involving the change of states. If this definition of exothermic is
such defined then this is a true statement. )
A. the energy gap between
adjacent energy levels become smaller when the n increased (Comment: this is true in the special case of
Bohr*s hydrogen model. Generally this is not the case (such as in the
particle-in-the-box model).)
B. the increase in the
quantum number n in Bohr*s atom means the increase of the positive energy. (err#this statement sounds a bit redundant as it
may give rise to possible confusion of whether there is other thing called the
※negative energy§. I would put it simply as &the increase in the quantum
number n in Bohr*s atom means the increase of the energy of the atomic state*
to make the statement a true statement.)
C. when n approach infinity, the energy states become infinity. (this is a false statement.)
D. Free electron is the
electron which is not in the bounded system. (this is a true statement.)
ANS: DIY
By Ahmad Zainal b.
I. Electron should absord energy continuously
from the electromagnetic waves. (true in classical
theory)
II. At low intensity, a
measurable time interval should pass between the instant the light is turned on
and the time an electron is ejected from the metal. (true in classical theory)
III. There should be a
relationship liking the frequency of the light used in the experiment with the
electron*s kinetic energy measured. (false in classical
theory)
IV. Electron should be ejected from the metal only if the
light frequency is above certain threshold value, as long as the light
intensity is sufficiently high. (false in classical
theory)
A. I, II B.
II, III C. I,IV D.
II only E.
Non of the above
ANS: DIY
I.
Kmax is dependent on the
light intensity (false)
II.
The maximum kinetic energy of
any one electron depends only on the light intensity and the work function (false)
III If the light intensity is
doubled, the number of photons arriving per unit time is doubled, which doubles
the number per unit time at which photoelectrons are emitted. (true)
IV.
For a given metal
surface the maximum kinetic energy of the photoelectrons is not fixed for a
given light frequency and intensity. (false)
A. I, II B.
II, III C. I,IV D.
II only E.
Non of the above
By Norazura binti nen, 74477/03
a) e times the stopping potential
against photon frequency is a straight line for each metal.
b) Photocurrent against potential is a straight line of
slope h for each metal
c) Photocurrent against incident intensity is a straight
line of slope h for each metal
d) Incident intensity against photon frequency is a straight
line of slope cutoff for each metal
e) None of these
(Comment: err#again I suspect this question
is not original lah. Please correct me if I am wrong.)
By vun tze woei, 74658/03
i. Stopping potential,
Vs is dependent on the intensity of the radiation.
ii. Different materials have different cut-off frequency, fo.
iii. An identical material can have many Vs values.
iv. Frequency below fo gives no PE
effect but the PE effect occurs when a highly intensed radiation is
shined on the metal surface.
A. i, ii B. ii,
iii C. ii, iii, iv
D i, iv E. none from above (ANS: DIY)
i. there is no time lag
ii. photoelectrons can be kicked
out from the metal surface at any intensity.
iii.Kmax is dependent on the frequency of
the radiation.
iv. Vs is also dependent on the frequency
of the radiation.
A. i B. ii, iv C. i, iii,
iv D. i, ii,
iii E.none from above. (ANS: DIY)
(comment:
these questions (Q32,33) were only received on 18.2.05 the day test II takes
place. Despite that it is a bit too late I still put
them up as an encouragement to motivate students to send in more questions.)
By Teh Kheng Hock 82737; Wong Chee Hong 82227
A. Space Pod A in relativistic view, Space Pod B in
classical view;
B. Space Pod B in relativistic view, Space Pod A in
classical view;
C. Space Pod A in relativistic view, Space Pod A in
classical view;
D. Space Pod B in relativistic view, Space Pod B in
classical view;
E. Both of them cross the finishing line together.
Our answers to the above
questions would be : B
Because, whoever who needed
the shortest time to reach the finishing line would definitely finish first.. s=vt, t=s/v.With classical
calculations, A*s time would be shorter. However, in relativistic view, the
distance is shortened by the lorentz factor. I assumed the speed, v, to be
constant at both views..
I hope you understand what I
mean, sir#I also seriously do not know if my question is correct at all.. am just trying, albeit too
late..
(comment: hmm#as a fact I do not go thru the calculation and argument for the
answer. Lets leave it to the reader to justify what u
say. My comment is: if this is indeed an authentic question from you then
bravo, it*s a very creative question, at leastfor the phrasing part.)
I.
If one is able to fly at near the speed of light, in the opposite direction of
the
earth*s
rotation, according to time dilation, he should be able to travel back in
time.
(F)
II.
Likewise, if one flies near the speed of light, along the earth*s rotation, he
or
she
should be able to travel to the future. (F)
III.
The rest mass of an object is always smaller than its relativistic mass. (T)
IV.
The relativistic mass of an object depends on its speed and time only. (err#to be more precise u should say ※The
relativistic mass of an object depends on the state of motion in the frame it
is observed§, then will then make the question a true statement. It is not
quite true to say that the relativistic mass does not depend on the time it
experience as time is an integral part of the fabric of space and time.)
A.I
and II
B.III
only
C.III
and IV
D.I,
II and III
E.
None of the above.
I.
As the object approaches the speed of light, c, it*s
length would contract. If it
reaches
c, the object would thus have no length at all. (comment: err#.in realistic situation we would never reach c but only
approach to that limit closer and closer.So the sentence ※If it
reaches
c, the object would thus have no length at all§ seems to be only correct as a theoretical discription but never
realise in practice. Any way such a statement is still considered a validly
true statement)
II.As
the object approaches the speed of light, its mass would increase; thus, if it
reaches
c, the object would have infinite mass, which is impossible. (T)
III.
To reach the speed of light, much energy is needed, and subsequently, to reach
the
speed of light, infinite energy is needed, something of which, is impossible.
(T)
IV.
According to the time dilation effect, it will take infinite time to obtain or
go
over
the speed of light. (err#seems to be a
true statement but the wording have to modify a bit to, say, ※According to the
time dilation effect, it will take infinite time to reach the speed of light.§
A. I and II
B. I , II and III
C. III only
D. I, II, III and IV
E. None of the above
ANS:
B. I came up with this question remembering the tutorial session you had with us :D kinda un-authentic.. I apologize for that....(comment: it*s
considered an authentic question, at least it shows that u do listen while in
the tutorial class. A Plus to you. =) )
I.
The laws of quantum mechanics are only valid in the atomic domain (F)
II.
The laws of classical physics are only valid in the classical domain (T)
III.
The laws of quantum mechanics are valid in a domain where atomic and
classical domains overlap. (T)
IV.
The laws of classical physics are valid in a domain where atomic and classical
domains overlap. (F)
A. I and II
B. III and IV
C. I, II, III and IV
D. I, II and III
E. None of the above.
Question by: 1.Hadijah Awang Mahmud ( 52488/99
); 2. Masitah Wahidon ( 72084/02 ); 3. Hazura Hashim ( 72060/02 ); 4. Sharifah Nurah Sayed Dol Islam ( 58861/00 )
( Apabila cahaya laser dari gabungan
Nd:YAG dan Nd:Kaca difokuskan ke dalam satu medium plasma, electron dipecutkan
& dihayunkan dalam halaju yang sangat hampir kepada c. Tenaga kinetik terhasil
adalah 400MeV. Berapakah panjang gelombang de Broglienya ? )
Answer/Jawapan : 7.76 X 10-14 m
( Jika menggunakan laser terdenyut
VULCAN dalam tempoh 1ps pada jarak gelombang 1 米m untuk menembak satu medium plasma mengandungi gas He, berapakah
tenaga yang dipakai oleh elektron gas He untuk mengion ? )
Answer/Jawapan : 2733eV atau 2.7333 X 10-16 J
(Soalan
berdasarkan Misi Cassini-Huygens ke Planet Zuhal serta bulannya yang terbesar,
Titan oleh NASA, ESA dan ASI. Cassini adalah kapal angkasa pengorbit manakala
Huygens adalah probe yang dihantar ke Titan )
(a)On
( Pada tanggal 14 Januari 2005,
teleskop radio Robert C. Byrd Green Bank di Virginia Barat, AS telah mengesan
isyarat dari Huygens sejurus selepas prob tersebut memulakan kemasukannya ke
atmosfera Titan. Ia berlaku pada pukul
Calculate
:
(i)
Saturn
time if the signal from Huygens*s Probe traveled to Earth in 1 hour and 14
seconds.
( Masa di Planet Zuhal jika isyarat dari Huygens bergerak ke Bumi dalam tempoh
1jam 14minit )
(ii)
How
fast was the signal traveling from Saturn to Earth ?
( Using the same
signal transfer time as in (i). Considering Saturn frame is including Titan
& Cassini-Huygens )
( Berapakah kelajuan isyarat bergerak dari Zuhal ke Bumi ? Gunakan masa perpindahan
isyarat yang sama seperti (i). Anggapkan rangka
rujukan Zuhal adalah merangkumi Titan serta Cassini-Huygens )
( Att : All times are written in
24-hours system not am/pm system. )
(Perhatian
: Semua waktu ditulis dalam sistem 24-jam, bukannya sistem am/pm )
Answers : (i) Pukul
(ii) V=0.99999974c
(b)On this case, Huygens
probe has landed on Titan*s surface. Saturn-Earth distances is 8.5 4 AU ( Asronomical Unit ) & Saturn-Titan distances is 1,221,830 km. If the landing signal from
Huygens was arrived on Earth by the same velocity as the answer for (a) (ii),
what is Titan-Earth distance according to the signal in km ?
Take as Titan, Saturn & Earth are in stationary state and assembled in the
same line.
( Pada kes ini, prob Huygens probe telah mendarat pada
permukaan Titan,
Jarak Planet Zuhal 每 Bumi adalah 8.54 AU
(Unit Astronomi) & Saturn-Titan pula sejauh 1,221,830km. Jika isyarat
pendaratan daripada Huygens sampai ke Bumi pada halaju yang sama dengan jawapan
di (a) (ii), apakah jarak Titan-Bumi berdasarkan isyarat, dalam unit km ?
Anggap Titan, Zuhal dan Bumi dalam keadaan pegun dan tersusun pada satu garis
yang sama. )
( 1AU= 149, 597, 870. 691km )
Ans/Jawapan
: 290, 988. 6936km
(comment: seemingly an interesting question to try
out. Please feed back if you are not totally agree
with the answer provided.)
( Pilih pernyataan yang benar bagi
malapetaka UV dan IR )
I)
UV
Catastrophe describing mismatch that happened in the Rayleigh-Jeans Law of
blackbody radiations while IR catastrophe describing insufficiency of
( Malapetaka UV menggambarkan
ketidakserasian yang timbul dalam Hukum Rayleigh-Jeans untuk Sinaran Jasad
Hitam sementara Malapetaka IR menggambarkan ketidakberkesanan model
II)
In IR
catastrophe, Rutherford Model of Atom has a fatal flaw according to classical
EM.
( Dalam Malapetaka IR, Model Atom
III)
A major
disagreement happened between theoretical prediction and experimental results
at short wavelength caused UV catastrophe in Rayleigh-Jeans Law.
( Ketidaksetujuan yang besar berlaku di
antara ramalan teori dan keputusan experimen pada panjang gelombang yang pendek menyebabkan malapetaka UV pada
hukum Rayleigh-Jeans )
IV)
Rutherford
Model of Atom can*t explain the discrete spectrum, thus causing IR catastrophe
( Model Atom
By SOFIAH BINTI MOHD AMIR, 82689/04
(Comment: Sofiah admitted that the questions she submuitted are designed
by her (by making reference to some sources)except
question the second question.
I.
A continuous spectrum of radiations is emitted by the object.
II. The peak
of the intensity distribution shifts to shorter wavelength.
III. The total energy emitted
from an object increases with temperature
IV. The charges particle in
the atoms near the surface accelerated with various amount of thermal energy.
A.
1,11 B.
11,111 C.
111 D.
1,11,111,1V E.
None of the above
A. Photon is a
particle with positive charge
B. Photon is
a particle with negative charge
C. Photon is the
electron which is produced when light is incident on a metal
surface
D. Photon is a
quantum of electromagnetic wave
E. None of
the above
I.
The maximum kinetic energy of the photoelectrons remains constant
II. The
maximum kinetic energy of the photoelectrons will increases
III. The photoelectric current
will remain constant
IV. The photoelectric current
will increases
A. 1,11 B.
11,111 C.
111,1V D.
1,1V E.
None of the above
A. Have different
velocities
B. Have the
same wavelength
C. Are deflected
by a magnetic field
D. Can be detected
by photoelectric plate
E. None of
the above
I.
The de Broglie wavelength of electron can be controlled by the voltage of the
electron gun
II.
Electrons can be focused by using the electronic or magnetic field
III. Electrons can be
accelerated by electric field
IV. Electrons is quantized (comment: err.. this
statement is diffuclt to justify. What exactly you mean by the the term
&quantised*? You have to be specific here. For example, does the de Broglie*s
wavelength of the
electron quantised? The speed? So you got to be more
specfic here. )
A. 1,11,111
B. 1,111,1V
C. 11,111,1V
D. 1,11,111,1V
E. None of
the above
Disediakan
oleh farah ha num binti mohd noh 82328
I Maxwell II
Planck III De broglie IV
Thompson
A I,II,III
B
III C
II,III D semua diatas E tiada jawapan
(comment: Sebenarnya bukan semua postulat itu adalah berdasarkan teori klasik,
misalnya, postulat tenaga foton = beza paras tenaga dalam orbit adalah
berdasarkan postulat Einstein. Begitu juga de Broglie*s punya
postulat bukanlah daripada teori &klasik*. Kenyataan
bahawa ※Maxwell punya teory ada kaitan dengan teori Bohr§ adalah terlalu umum
untuk dikatagorikan sbg ya atau tidak.)
I spektrum
yang terhasil adalah continuos.
II metal yang berbeza
memberikan lmin yang
berbeza pada beza keupayaan yang sama.
III nilai l yang kurang daripada lmin tidak akan menghasilkan x
ray.
(comment: kenyataan ini adalah kurang jitu dan mengelirukan. Misalnya,
apakah definasi l yang dimaksudkan di sini? Di sini
anda kena membezakan kesan fotoeletrik drp kesan penghasilan x-ray.)
IV beza keupayaan yang
semakin bertambah akan menambahkan nilai lmin.
A I,II,II
B II,III C
I,III D
semua diatas E
tiada jawapan
I RJ
II planck
anggap gelombang pegun yang terhasil pada setiap pengayun harmonic hanya
menyerap dan memancar tenaga dalam bentuk selanjar.
III RJ hanya benar pada l yang besar
IV bagi frekuensi yang
rendah, teori planck adalah bertepatan dengan teori
RJ.
I tenaga sinaran EM
merupakan suatu kuanta yang dipanggil foton
II kadar
penghasilan elektron yang dipancarkan oleh 1 logam bergantung pada keamatan
sinaran
III elektron akan dikeluarkan serta merta dari logam sebaik sahaja
sinaran mengenainya
IV tenaga kinetik maximum
elektron yang dipancarkan adalah berkadar terus dengan keamatan sinaran
A mengesan kewujudan corak
belauan di atas cermin
B mengesan aras tenaga yang diskrit di dalam atom hydrogen
C membuktikan sifat kedualan
zarah
D membuktikan kewujudan eter
By toh pek lan 82211/04
I The second postulate for Einstein*s special theory of
relativity is consistent with the negative result of the Michelson-Morley
experiment which failed to detect the speed of the earth with respect to the
hypothetical ether.
II The
speed of light in vacuum is the same for all observers, dependent of the motion
of the light source. (comment: this is an ill question lah, sort of an
oximoron. ※light in vacuum is the same for all observers§ and ※the speed of light is
dependent of the motion of the light source§ are two contradicting statements. One
should avoid designing such question to avoid uncessary confusion.)
III Two
event that are simultaneous in one reference frame are
in general simultaneous in another frame which is moving with respect to the
first.
IV Galilean
transformation is inconsistency between EM and Newtonian view of absolute time , space, mass and energy.
(comment: apa dia itu spectrum garis ciri? Adakah anda rujuk kpd specktrum daripada gas? Jika tak,
apakah sebenarnya dia? Saya suspect anda cuba tanyakan
soalan tentang garis ciri logam dalam proses penghasilan x-ray, betulke saya?
Tapi, dalam syarahan saya ataupun nota tiada disentuh tentang garis -ciri dalam
spektrum sinar-x
logam. Maka, dengan alasan ini, sata syaki soalan anda ini
di§kopi§ sesuka-suka sahaja daripada buku-buku yang tertentu tanpa
meninmbangkan samada adakah ia relevan dengan silibus kita ini atau tidak. Jadi
nak ※kopi§ soalan pun sila guna kefahaman sikit lah#)
I Bergantung kepada tenaga kinetic
electron yang hentam logam.
II Boleh diterangkan oleh teori gelombang
III Boleh diterangkan oleh teori foton
IV Bergantung kepada jenis logam sahaja
A. I,II B. I,II,III,IV C. I, II, III D. III.IV
E. Non of the above
I Tenaga kinetic maksimum
fotoelektron tidak bergantung kepada keamatan cahaya.
II Tenaga kinetic maksimum
fotoelektron tidak bergantung kepada frekuensi tetapi bergantung kepada panjang
gelombang.
III Jika frekuensi cahaya kurang dari nilai tertentu ( frekuensi ambang ), tiada fotoelectron boleh dibebaskan
walaupun keamatan cahaya sangat tinggi. Sebaliknya, bila frekuensi cahaya lebih
daripada frekuensi ambang, fotoelektron akan
dibebaskan walaupun keamatan cahaya sangat rendah.
IV Fotoelectron akan
dibebaskan serta merta apabila fotoelectron memungut tenaga yang mencukupi
untuk bebaskan diri dari permukaan logam.
(comment: jenis soalan itu adalah terlalu biasa dah.
I light
frequency
II work
function
III light
intensity
IV light
energy
A II,
III
B I,
II, III
C I,
II, IV
D I,
III, IV
E Non of the above
(comment: jenis soalan itu adalah terlalu biasa dah.
I proton II
electron III
neutron IV particle
a
A I,
III B II,
IV C III D II
E Non of the above
(comment: jenis soalan itu adalah terlalu biasa dah.
I it
is described as a particle in the photoelectron effect
II it
is described as a wave when the diffraction of electron from a crystalline
surface
III it
is described as a particle in phenomena such as atomic transitions and the
photoelectric effect
IV it
is described as a wave in phenomena such as interference and diffraction
A I,
II
B II,
III
C III,
IV
D I,
IV
E Non of the above
I it
is described as a particle in the photoelectron effect
II it
is described as a wave in the diffraction of electron from a crystalline
surface
III it
is described as a particle in phenomena such as atomic transitions and the
photoelectric effect
IV it
is described as a wave in phenomena such as interference and diffraction
A I,
II
B II,
III
C III,
IV
D I,
IV
E Non of the above
Answer : B
(both questions aboth seems to be original to me)
I The electron moves in circular orbits about the atom under
the influence of the Coulomb force of attraction.
II Only
certain orbits are stable.
III Radiation
is emitted by the atom when the electron jumps from a more energic initial
stationary to a higher state.
IV The
size of the allowed electron orbits is determined by an additional quantum
condition imposed or the electron*s orbital angular momentum.
A I,
II, III
B I, III, IV
C II,
IV
D I,
II
E Non of the above
By OOI YEE NING(82113)
a) Gravitational forces play a significant role.
b) Electrons do not radiate energy when they are in a stable orbit
c) The electrons spiral into the nucleus
d) The energy of an electron in a stable orbit is an integral multiple of
h/(2p)
e) None of these is correct
(comment: this doesn*t sound as an original question to me)
a) 656nm
b) 486nm
c) 434nm
d) 410nm
e) none of these is correct
(comment: this doesn*t sound as an original question to me)
a) The obits in the Bohr model have precise sizes,
whereas in the quantum mechanical picture of the hydrogen atom they do not.
b) In the absence of external magnetic fields both the
Bohr model and quantum mechanics predict the same total energy for the electron
in the hydrogen atom.
c) The spin angular momentum of the electron plays a
role in both the Bohr model and in the quantum mechanical picture of the
hydrogen atom.
d) The magnitude of the orbital angular momentum
cannot be zero in the Bohr model, but it can be zero in the quantum mechanical
picture of the hydrogen atom.
(comment: this doesn*t sound as an original question
to me)
a.
The quantum
number ni that identifies the higher
energy level from which the electron falls into a lower energy level.
b. The quantum number nf
that identifies the lower energy level into which the electron falls from a
higher energy level.
c.
The ratio nf /ni,
where nf is the quantum number that identifies the lower
energy level into which the electron falls and ni is the
quantum number that identifies the higher level from which the electron falls.
d. The sum nf + ni
of two quantum numbers, where nf identifies the lower energy
level into which the electron falls and ni identifies the
higher level from which the electron falls.
e.
The difference nf - ni of two
quantum numbers, where nf identifies the lower energy level
into which the electron falls and ni identifies the higher
level from which the electron falls.
(sorry, I still suspect that this is not an original question. Please correct
me if I am wrong)
By YENG TIAN LOON ( 82794 )
a) Is transmitted through a boundary surface into a medium that is more dense than the medium from which the wave came.
b) Is transmitted through a boundary surface into a medium that is less
dense than the medium from which the wave came.
c) Reflects from the boundary surface of a medium that is less dense than
the medium in which the wave is traveling.
d) Reflects from the boundary surface of a medium that is more dense than
the medium in which the wave traveling.
e) Both c and d are correct.
(This is obviously a copied question as we
never mention about such kind of concept througout the course, neither in the
lecture nor in the lecture notes. So I suspect this to be a question copied
from elsewher. Correct me if I am wrong. But I am not going to believe you
unless you convince me other wise. If u want to copy
also please copy wisely lah my dear friend.)
a) Is constrained by the boundary conditions y(0)=0 and y(L)=0.
b) Must be zero everywhere outside of the box.
c) Is given by y(x)=Asinkx, where A is a constant. (comment: this statement is not generally correct as the form of the solution
depends on the choice of origin in the well.)
d) Restricts the possible energy of the particle to E=U²K²/(2m). (what the heck is U?)
e) All of these are correct.
By LIM SEANG CHIN (82445)
a) the
average kinetic energy of the emitted electron increase.
b) The maximum kinetic energy of the emitted electron increase.
c) The minimum kinetic energy of the emitted electron decreases.
d) The minimum kinetic of the emitted electron increase.
e) The average kinetic energy of the emitted electron decrease.
f)
(almost pengsan when reading your question. Its so grammatically very ill lah.
Your question should be like this: ※When the incident light irradiated on a
given mental surface is increased in the wavelenght§. In any case, the
question is just too boring and lack of originality.)
By NAME: NURRUL ANISAH BT ISMAIL; MATRIC NO: 82608/04
a)
h/E2-E1
b)
hc/E2-E1
c)
E2-E1/h
d)
E2-E1/hc
a)
Electron is losing energy while orbiting around a nucleus.
b)
Electron can change its orbit by radiation of energy.
c)
Electron can orbit around the nucleus in certain orbit without emission of
energy.
d)
Electron is allowed to move in orbit which has angular momentum
multiple of h/2.
(Sounds not copying from elsewhere but they are too simple.)
Prepared by Nor Aini
Suhaidanㄛ 71588/02
A) photons that are absorbed by atoms in the target in PE effect shall
eject photoelectrons immediately
B)the energy of the single photon is given by E=hv
C)a photon can also materialized into an electron and a positron
D)kinetic energy of electron is transfered to energy of photons (comment: this last statement is meaningless
because it does not specifically refer to any process.)
b)hn and Wo depend on
the radiation intensity
c)the energy of the photons is in concentrated bundles
d)there is a time lag in the PE effect (this
statement is not precise enough to make it a sensible one.)
By MAZIDAH BINTI ISMAIL, 72237/02
i.
It does not work for atom with
more than one electron
ii.
In Bohr theory
the angular*s momentum is quantized.
iii.
It cannot predict the relative
intensities of the photon radiation from atoms.
iv.
Bohr*s model is based on
Thompson*s model
A.
i , ii
B.
ii
C.
i ii iii
D.
i, ii, iii, iv
E.
none of above
A.
1.023 x 1023
B.
1.023 x 10-23
C.
1.509 x 10-23
D.
1.509 x 1023
E.
none of
above
(this seems to be not an original question to me)
BY Chew Siau Huey 79060/04
i. bahan yang sama dan disinari oleh cahaya yang
mempunyai keamatan cahaya yang berbeza.
ii. bahan
yang sama dan disinari oleh cahaya yang mempunyai keamatan cahaya yang
sama
tapi frekuensi cahaya yang berbeza.
iii. bahan
yang berlainan tapi disinari oleh cahaya yang mempunyai keamatan dan frekuensi
yang sama.
iv. bahan
yang berlainan tapi disinari oleh cahaya yang mempunyai keamatan cahaya
yang
sama tapi frekuensi cahaya yang berbeza.
(looks
like quite original but the phrasing of the question requires some touching up
to make it sound clearer and gramatically-free)
By Cik Maisarah Hussain
(68269/02), Hasniyah Sulaiman (68295/02)
I.
DG fails to confirm the wave
nature of electron
II.
DG confirm the wave nature of
electron
III.
The electron in the DG experiment
is accelerated to K= 54 eV (comment: this
is not a good question to ask. This is a physics course not a history course.
The figure ※54 eV or 54 keV§ does not really matter here. What really important
about that experiment is the observation of diffraction pattern by electron.))
IV.
Electron do behave like particle
as postulated by de Broglie
A.
I, II B.
II, III C. I, IV D. IV
I. The
smallest orbit or hydrogen, the Bohr*s radius; r0 = 4羽Є02/mee2
II. If the
change of energy is positive, the energy must be absorbed (comment: you got to define the statement more precisely than here, e.g.
※ if the change of the energy of an atom in an process
is +ve that would mean energy are absorbed by the atom. Such a statement would
un-ambiguously make the statement a true one.)
III.
Electron
at high n is not tightly bounded to the nucleus by the EM
force
IV. When
an excited electron in the atom falls back to the lower energy states
(de-excited), EM wave is absorbed
A.
I, II B.
II, III C. II, IV D. II, III, IV
Answer:
C
A.
Beliau menganggap tenaga yang
dikeluarkan oleh sebarang pengayun adalan dalam bentuk kuantum.
B.
Apabila nilai frekuensi melebihi
frekuensi ambang, keamatan cahaya akan berkurang
menyebabkan jumlah kuanta cahaya bertambah.
C.
Elektron yang dikeluarkan akan bertambah jika nilai frekuensi kurang daripada
frekuensi ambang.
D.
Nilai frekuensi ambang bergantung
kepada keamatan sinaran dan tidak bergantung kepada jenis logam.
V.
Garis-garis spektrum kelihatan
semakin jauh antara satu sama lain apabila panjang
gelombangnya semakin pendek.
VI.
Di dalam kawasan ultraungu, siri
Lyman yang mengandungi garis-garis spektrum telah ditemui.
VII.
Panjang gelombang minimum bagi
spectrum atom dalam siri Balmer ialah 3.65x10-7 m
VIII.
Siri Brackett melibatkan
peralihan elektron daripada orbit-orbit yang lebih tinggi kepada orbit n=3
A. I, II, III B.
II, III C. I,
II D.
II, III, IV E.
I, III
IX.
Dalam proses
X.
Dalam proses fotoelektrik, foton akan memindahkan seluruh tenaganya untuk membebaskan
elektron dari ikatan atom. (sounds like
copying from my past year question)
XI.
Tenaga kinetik maksimum elektron
yang dipancarkan berkadar terus dengan keamatan sinaran dan bukannya frekuensi
sinaran (Hey, what process are you
talking about here? PE or Compton? Whithout this made clear this statement makes
no sense.)
XII.
Dalam proses serakan
By ZURAINY BINTI MD NAYI, MATRIC NO: 82244
a)
Maxwell
b)
Galilean
c)
Einstein
d)
Planck
(this is not a good question to ask in a physics course else it would be
like a history course. We should ask more physics-relavent question instead of
memorising history.)
By Teh Kheng Hock 82737, Wong Chee Hong 82227 (Due to time limitation I have not
carefully checked thru the questions posted below. But I think they are
quthentic and original)
A.
Space Pod A in relativistic view,
Space Pod B in classical view;
B.
Space Pod B in relativistic view,
Space Pod A in classical view;
C.
Space Pod A in relativistic view,
Space Pod A in classical view;
D.
Space Pod B in relativistic view,
Space Pod B in classical view;
E.
Both of them cross the finishing
line together.
I. If one
is able to fly, near the speed of light, in the opposite direction of the
earth*s
rotation, according to time dilation, he should be able to travel back in
time.
II.
Likewise, if one flies near the speed of light, along the earth*s rotation, he
or
she
should be able to travel to the future.
III. The
rest mass of an object is always smaller than its relativistic mass.
IV. The
relativistic mass of an object depends on its speed and time only.
A.I and
II
B.III
only
C.III and
IV
D.I, II
and III
E. None
of the above.
I. As the
object approaches the speed of light, c, it*s length
would contract. If it
reaches
c, the object would thus have no length at all.
II.As the
object approaches the speed of light, its mass would increase; thus, if it
reaches
c, the object would have infinite mass, which is impossible.
III. To
reach the speed of light, much energy is needed, and subsequently, to reach
the
speed of light, infinite energy is needed, something of which, is impossible.
IV.
According to the time dilation effect, it will take infinite time to obtain or
go
over
the speed of light.
A.
I and II
B.
I , II and III
C.
III only
D.
I, II, III and IV
E.
None of the above
I.
The laws of quantum mechanics are only valid in the atomic domain
II.
The laws of classical physics are only valid in the classical domain
III.
The laws of quantum mechanics are valid in a domain where atomic and
classical domains overlap.
IV.
The laws of classical physics are valid in a domain where atomic and classical
domains overlap.
A.
I and II
B.
III and IV
C.
I, II, III and IV
D.
I, II and III
E.
None of the above.
Our answers to the above questions would be :
80. B
Because, whoever who needed the shortest time to
reach the finishing line would definitely finish first..
s=vt, t=s/v.With classical calculations, A*s time
would be shorter. However, in relativistic view, the
distance is shortened by the lorentz factor. I assumed the speed, v, to be
constant at both views..
I hope you understand what I mean, sir..
I also seriously do not know if my question is
correct at all.. am just
trying, albeit too late..
81. B.
The first and second statement, We recall from
somewhere, is false.. The third is obviously true,
while the last is false because relativistic mass doesn*t depend on time..
82.B
I came up with this question remembering the
tutorial session you had with us :D kinda
un-authentic.. I apologize for that....
83 B
The options 3 and 4 are obviously correct, the
first and second are only partially correct, as the word &only* made them
invalid..
By 1.FURQAN AULIA
(67454/01), 2. FAUZANA AHMAD DZIAUDDIN (66978/01), 3.
MARLIANA MOHAMED AKHIR / (66994/01)
comment: this question seems
to be too canggih lah. In fizik we dunt really know how to &convert* an IR to a X-ray. So may be you should rephrase you question by
saying: ※what are the difference between the energies and wavelenght of an IR
compered with a x-ray? Then you got to rephrase your
option too so that they are consistent with the way the question is posed§. In short this
question is illy phrase but could be made sensible if it corrected properly.
By Tan Hooi Sin, 79295/04
Ans:
D
|
I |
II |
III |
A |
Photoelectric Effect |
|
Pair Annihilation |
B |
Photoelectric Effect |
|
Pair Production |
C |
Pair Annihilation |
Photoelectric Effect |
|
D |
Pair Production |
|
Photoelectric Effect |
By
WAN NORSURYANI BT WAN NASRU, MATRIC NO:82221/4 (comment: I will take these questions as not
original.)
photoelectrons are produced. If another light of larger wavelength is used,
a)
The average kinetic energy of photoelectrons emitted decreases.
b)
The average kinetic energy of photoelectrons emitted increases.
c)
The kinetic energy of photoelectrons emitted remains unchanged.
d)
The average kinetic energy of photoelectrons emitted has the minimum value.
a)
All atoms.
b)
All charged atoms.
c)
All atoms with spin number ½.
d) All atoms with
one electron.
By Yam Ing
Yee (74150/03), Tan Sze Nee (74121/03) (I think these questions are very
original despite some defects. Good to u all.)
a. All the
Theory Classical Physics can be used straight away in the Physics modern . (it*s a good statement
to ask but maybe the wording needs to be rephrase a bit)
b. Galilean Transformation can be used successfully in the
field of electric and magnetic. (maybe u should say:
※We can always apply GT to the Maxwell theory of light§. However, such a statement is not of much significant or make much
sense. GT can be ※always successfully§ applied to any theory or any laws of
physics, irrespective of whether the outcome of the application is consistent with
established fact or not.)
c. We have to change Lorentz Transformation to
Galilean Transformation at high velocity. (The
phrasing is a bit not right. Maybe u should say: ※when the velocity is involved is
approaching to that of the speed of light in free space c, we have to supplant
Galilean transformation with that of Lorentz§)
d.
Classical EM theory is inconsistent with Galilean Transformation.
a. There are
no interactions between particle and wave. (this is not a good question to ask lah. Its too
general.)
b. Energy can
be carried by through particle and wave. (comment: energy can be carried in the form of particle or in the form of wave.)
c. According
de-Broglie , electron can become wave and particle
simultaneously. (de Broglie says electron should also has wave
property. However, when one says ※electron can become wave and particle
simultaneously§ then this is a difficult statement to say yes because the wave
and particle nature cannot show up simultaneously. Its kind
of too philosophical to be a good physics question in an objective form.)
d. The
photon carries energy is in contrast to the way wave carries energy
. (sounds ok to me)
a. When the
light is incident on certain metallic surface ,
electrons can be emitted from the surface is called black body radiation. (wow! This really sounds &original*. It*s a good
question to trap those who are confused between different physical processes.)
b. The
maximum Kinetic energy of the photoelectrons increase when the light frequency increase .
c. According
to the Planck*s Hypothesis, as the intensity of the radiation-emitting black body decrease
,the temperature will increase. (obviously this is a
false statement)
d. Electrons
will be emitted if the incident light frequency falls below cutoff frequency.
Prepaired by: Ching Chin Guan, Metric number: 81838
(ok)
A)0.71m heght & 2.00m width
B)5.00m height & 0.28m width
C) 0.71m height & 0.28
width
D) 4.50m height & 2.87m width
E) The dimension of the car
did not change
Ans: E
i ) cater for the loses of kinetic energy due to internal collision of the
electron .
ii ) radiate
photon from the atom
iii ) eject all the electron in the atom
iv ) overcome the attraction from the atom in the surface.
Chose which of the following
combination below is TRUE.
A) i,
ii, iii, iv
B) i, iv C) ii,
iv D)ii,
iii, iv
E) None of the above
I.
Charge
conservation, total linear momentum, total relativistic energy are to be obeyed
in the process.
II.
Pair production
must not occur in empty space.
III.
Pair production
must occurs in proximity of a nucleus.
IV.
Pair production
must occurs when two particle collides witheach other.
A) i,
ii, ii, iv
B) i,ii, iv C)i,
ii, iii
D)ii, iii, iv
E) None of the above
By EU HAN PEEU (81855/04) (these questions sounds too
ordinary and not original)
Soalan-soalan ini disediakan oleh:-Sim Chong
Keat (82668/04), Teoh Chong Yew (82750/04) (Sounds like very very standard exam questions lah. I don*t really see
much originality here. Furthermore, I need questions in objective form, not
structured form.)
susunan ujikaji yang digunakan untuk mengkaji kesan
fotoelektrik.
(b) (i) Jelaskan bagaimana anda menggunakan susunan ujikaji
itu untuk
menentukan frekuensi ambang suatu logam?
(ii)Lakar pada paksi yang sama,graf
bagi keputusan yang mungkin anda
dapati bagi dua logam yang berlainan dalam
ujikaji yang serupa dan huraikan,
dengan memberi sebab-sebab, keserupaan dan
perbezaan bentuk graf-graf itu.
dalam satu tiub vakum disinari dengan cahaya
monokromatik.Jika eksperimen ini
diulangi dengan cahaya yang sama panjang gelombang tetapi
dengan keamatan
dua kali keamatan asal ,bagaimana ini akan mempengaruhi
(a)
tenaga foton,
(b)
tenaga kinetic maksimum fotoelektron,
(c)
fungsi kerja
logam itu,
(d)
arus foto?
apakah yang dimaksudkan oleh pernyataan ini.Hitungkan laju
minimum electron
yang boleh mengujakan satu atom hydrogen.
Questioned by :LOW BOON HOOI
(82461/04) (Sounds like the questions are designed based on the
notes. Nevertherless this is better than copy bulat-bulat from existing
questions bank.)
i All inertial
frames are equivalent
j All physical
processes analyzed in one frame can also be analyzed in order inertial frame
and yield consistent result
k A
transformation law is required to related the space and time coordinates from
one frame to another
l The length is
independent of the state of motion. So is the flowing rate of time
i A particle is
discrete or corpuscular in nature
j A particle
can*t be localized completely
k A particle has
mass
l A particle is
electrically charge
i The energy of
an oscillator can have only certain discrete values,E=h/mc
j The energy is
quantized
k Each discrete
energy value corresponds to the same quantum state
l The energies
of oscillators in the cavity must assume a continuous distribution
i Photoelectrons
are ejected from the metal
j The
photoelectrons are attracted to the collecting anode by potential
different
applied to the anode.
k The
photoelectrons are detected as electric current by the external
circuits
l a metal
surface is heated by the radiation of sufficient frequency, f
i X-ray is
produced when the metal surface is heated
j X-ray is
produced when the electrons in the vacuum cathode-ray is
accelerated
by an electric field n impacted on the end of the tube
k Part of the
kinetic energy of the moving electron is converted into a x-ray
l It involve the
much higher energy scale
By Name:Goh Kee Kuang, Metric number:82342
(nothing special lah. I am expecting more creative kind of questions than
these. For question 3, if this were designed by u yourself (but is not copy
almost bulat-bulat from somewhere) than it*s a good question. I wish you are good.)
(a) orange
(b)yellow
(c)violet
(d)ultraviolet
(a)
Emission of electrons from a hot
metal surface when the metal radiated by photons.
(b)
Emission of electrons from a cold
metal surface when the metal radiated by photons.
(c)
Emission of photons from a hot
metal surface when the metal radiated by electrons.
(d)
Emission of photons from a cold
metal surface when the metal radiated by electrons.
(a)
0.150c
(b)
0.994c
(c)
0.194c
(d)
0.085c
By Teh Heng Ti, Metric Number : 82735
In the experiments, Davidson and Germer
:
a)
Directed a beam of electrons onto
a crystal an a diffraction behavior was observed.
b)
Directed a beam of x-rays onto a
crystal and a diffraction behavior was observed.
c)
Performed Young*s double-slits
experiment with electrons and wave interference illustrated.
d)
Strikes an electron with x-ray
photon.
a)
1 and 3
b)
2 only
c)
1 , 2 and 3
d)
2 and 4
e)
None of above
Answer : c . Muon has mass of 105.7 MeV/c^2.Others have
no mass.
1.
The amount/intensity of radiation
emitted increase with increasing temperature.
2.
The wavelength of the radiation
emitted at 4000K is bigger than wavelength emitted at 3000K.
3.
The wavelength at which highest intensity
of the radiation are all same at 2000K , 3000K and 4000K because emit
from the same black body system.
4.
The total power emitted from the
radiation proportional is to T^2 ; T= temperature.
a)
1 , 2 and 4
b)
1 only
c)
2 , 3 and 4
d)
1 and 4
e)
none of above
Answer : b.
2)radiation wavelength at 4000K smaller then at
3000K.
3)wavelength at 4000K < 3000K < 2000K.
4)total power proportional to T^4
Answer : 2 and 3 are true.
By Name: Joanna Tan Choay Ee, Matric No. : 82379/04
I.
When an electron makes transition
from the highest level to the lowest level, the longest wavelength is emitted.
II.
Transition from lower energy
levels to higher levels is known as absorption.
III.
Bohr made an assumption that the
angular momentum of the electron is quantized.
IV.
Ernest Rutherford is the person
who provided the first model of the atom that predicted the discrete
wavelengths emitted by atomic hydrogen.
A. I, II B.
II, III C. II, III, IV D.
II, IV E. None of the above
(Ans: B) I
每 wrong because should be the shortest wavelength emitted.
IV-
wrong because not Ernest Rutherford, should be Niels Bohr
I.
X-ray can be produced when electrons
accelerated through a large potential difference and collide with a metal
target.
II.
The cut-off wavelength 竹羊 is not
independent of the target metal.
III.
Bremsstrahlung X-ray are emitted when the electrons decelerate.
IV.
X-rays are electromagnetic waves.
A. I, II B.
I, III C.
I, II, IV D.
I, III, IV E.
None of the above
(Ans: D) II-
wrong because the cut off wavelength is independent of the target metal.
I.
Two photons go in and one photon
comes out
II.
One photon goes in and two
photons come out
III.
The two electromagnetic waves are
coherent
IV.
The emitted photon travels in the
opposite direction as the coming photon
A. I, III B.
II, III C. I,
III, IV D.
II, III, IV E.
None of the above
(Ans: B) IV-
wrong because they travel in the same directions
(Despite not in the syllybus of zct 104 and being suspected a copycat, the
&designer* of the question claimned it to be original.)
I.
The Bohr radius = 0.53A which is
equal to 5.3x10‘¹³m
II.
The Frank-Hertz experiment shows
the excitation of the atoms to discrete energy levels
III.
The laws of quantum physics and
the laws of
classical physics do not give the same result (generally
this is not a true statement. In
the special case where the principle quantum number n is large both thoery
gives similar prediction.)
IV.
Classical EM predicts that an
electron in a circular motion will radiate EM wave at the same frequency.
A. II, IV B.
II, III , IV C.
I, II, III, IV D.
I, II, IV E.
None of the above
(Ans: D) III 每
wrong because both laws will give the same result
I.
Line spectrum is a series of
discrete electromagnetic wavelengths emitted by the atoms of a high-pressure
gas that is subjected to a sufficiently low potential difference.
II.
The line spectrum of atomic
hydrogen starts with the Balmer series. (this is an ill
question to be asked. What do u mean by ※start§? u got to be more specific here.)
III.
According to quantum mechanics,
an electron does not reside in a circular orbit.
IV.
In a normal room temperature,
most of the electrons in atoms are found in E=0.
A.I,II B.
I, III C.
III, IV D. I,
III, IV E.
None of the above
(Ans: E) I- wrong, should be low-pressure gas# high
potential difference
II 每 wrong, should be start with Lyman
series (its not very correct to say that
&The spectrum starts with Lyman series unless u make the statement more
precisely by referring to the length of the wavelengths)
IV-
wrong, E is not equal to zero.
So only III is correct.
I.
A photon in a vaccum always
travels at the speed v<<c
II.
A photon in a vaccum do has mass.
III.
Only light with a frequency equal
to a certain minumum value of f羊 will eject electron.
IV.
An electron situated at the
outside of the metal with the minimum energy will has
the kinetic energy as well.
A. I, II B.
II, III C.
II, IV D. II, III, IV E.
None of the above
(Ans: E)I 每 wrong, suppose to be at the speed, v=c
II
每 wrong, because photon does not have mass in vaccum
III
每 wrong, suppose to be frequency equal to or more than
IV
每 wrong, because at the outside of the metal, the electron does not have
kinetic energy
By Lim Hong Heng
,81929/04, Aw Gen San,81809/04
A. i, ii B. iii C. ii, iii, iv D iii, iv E. none from
above (ANS: A)
A. i, iii B. iii C. ii, iii, iv D i,ii,
iv E. none from
above (ANS: D)
A. i, iii B. iii C. ii, iii, iv D i,ii
E. none from
above (ANS: D)
I. Plum-pudding model fails
to explain the emission and absorption line spectrum from atoms because it
predicts only a single emission frequency
v = (1/2ƒÎ)ã(k/m)
II. Plum-pudding model
serves as a prototype to the next model which is built on the
experience gained from this model
III. The
Rutherford model succeed to explain the pattern of discrete spectral lines.
IV. Plum-pudding model
fails to explain the back-scattering of alpha particle seen in Rutherfordfs
scattering experiment
A. I,III
B. I,II,IV C. II,III,IV D. I,II,III,IV
E. none from above
(ANS: B)
By Ag Heng ,81929/04,
Aw Gen San,81809/04 (hm#sounds like u have gone through the notes and have
designed quite original questions based on them. Its
good.)
A. i, ii B. iii C. ii, iii, iv D iii, iv E. none from
above (ANS: A)
A. i, iii B. iii C. ii, iii, iv D i,ii,
iv E. none from
A. i, iii B. iii C. ii, iii, iv D i,ii
E. none from
I. Plum-pudding model fails
to explain the emission and absorption line spectrum from atoms because it
predicts only a single emission frequency
II. Plum-pudding model
serves as a prototype to the next model which is built on the experience gained
from this model
III. The
Rutherford model succeed to explain the pattern of discrete spectral lines.
IV. Plum-pudding model
fails to explain the back-scattering of alpha particle seen in Rutherfordfs
scattering experiment
A. I,III
B. I,II,IV C. II,III,IV D. I,II,III,IV
E. none from above
By Peter Neoh Soon Leong 82634/04 (if this is
originally from I think it*s a good question)
1. What theories best
describes the phenomenon??
a. Pair pruduction and
annihilation
b. de Broglie wave duality
c. Wave aspects of material
particles
d. Super imposition of waves
By: CHONG
LAI SOON 79067/04, WANG YUIIK LUNG
79319/04
A) r B) 2r C)
1/2 r D) 3/4 r E) none of above
Answer: A ( i think is A gua
because the angular velocity is perpendicular with the direction of the motion.
So, please correct me if im wrong lorrr. thank you
ar.) (comment: I think I agree with u gua#)