Planck's quantum theory is compatible with the experimental data related to which of the following?

1
Planck's quantum theory is compatible with the
experimental data related to which of the
following?

1. blackbody radiation
2. the photoelectric effect.
3. line spectra emitted by hydrogen gas
4. all of the choices

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2
Blue light will not eject electrons from a
certain metal however, which one of the
following may possibly eject electrons from that
metal?

1. infra-red
2. ultra-violet
3. red
4. green

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3
What is the energy associated with a light
quantum of wavelength 5.0 x 10-7 m? (h 6.63 x
10-34 J-s)

1. 4.0 x 10-19 J
2. 3.3 x 10-19 J
3. 1.5 x 10-19 J
4. 1.7 x 10-19 J

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4
If a monochromatic light beam with quantum energy
value of 3.0 eV incident upon a photocell where
the work function of the target metal is 1.60 eV,
what is the maximum kinetic energy of ejected
electrons?

1. 4.6 eV
2. 4.8 eV
3. 1.4 eV
4. 2.4 eV

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5
Which of the following devices represent(s) a
practical application of the photoelectric effect?

1. hologram
2. camera light intensity meter
3. both of the choices
4. none of the choices

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6
X-ray production occurs in which process?

1. photons hitting a metal, emitting electrons
2. electrons hitting a metal, emitting photons
3. photons hitting a metal, emitting X-rays
4. electrons hitting a metal and scattering elasticly

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7
Which of the following devices represent(s) a
practical application of the photoelectric effect?

1. hologram
2. camera light intensity meter
3. both of the choices
4. none of the choices

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8
An important use of X-ray diffraction was?

1. the observation of Compton scattering.
2. determining the structure of the DNA molecule.
3. production of positrons.
4. observation of the photoelectric effect.

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9
Which process cannot occur if only one photon is
involved?

1. pair annihilation
2. pair production
3. the photoelectric effect
4. X-ray production

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10
According to the principle of complementarity,
everything acts in a given experiment as if it is
either a wave or a particle. In which experiment
is the wave aspect exhibited?

1. the Davisson and Germer experiment
2. the photoelectric effect
3. pair production
4. Compton scattering

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11
The spacing between atoms in KCl crystal is 3.1 x
10-10 m. At what angle from the surface will a
beam of 3.14 x 10-11 m X-rays be constructively
scattered?

1. 57
2. 2.3
3. 90
4. 10

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12
The "seeing" ability or resolution of radiation
is determined by its wavelength. If the size of
an atom is approximately 10-10 m, how fast must
an electron travel to have a wavelength smaller
than that of an atom? (me 9.1 x 10-31 kg, h
6.626 x 10-34 J-s)

1. 7.28 x 106 m/s
2. 3.39 x 106 m/s
3. 1.03 x 106 m/s
4. 5.35 x 105 m/s

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13
The ultraviolet catastrophe predicts that?

1. all objects should radiate extreme amounts of
   ultraviolet light.
2. as an object gets hotter its light will change
   from dull red to blue white.
3. a black body can absorb an infinite amount of
   radiation if the radiation is in the ultraviolet
   region.
4. the radiated energy approaches zero as the
   wavelength approaches zero.

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14
According to Einstein, increasing the brightness
of a beam of light without changing its color
will increase?

1. the number of photons.
2. the energy of each photon.
3. the speed of the photons.
4. the frequency of the photons.

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15
Classical theories predict that most of the
energy from a black body should be radiated?

1. as thermal radiation in the infrared region.
2. at the wavelength given by Wien's displacement
   law.
3. as ultraviolet light.
4. a black body should not radiate.

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16
If a photon is absorbed by an electron, it will
give up more energy to that electron if the
photon?

1. is not spread out over many electrons.
2. is moving faster.
3. is moving slower.
4. has a higher frequency.

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17
If an electron has a measured wavelength of 0.85
x 10-10 m, what is its kinetic energy? (h 6.63
x 10-34 J-s, 1 eV 1.6 x 10-19 J, and me 9.11
x 10-31 kg)

1. 55 eV
2. 104 eV
3. 147 eV
4. 209 eV

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18
A sodium vapor lamp has a power output of 300 W.
If 590 nm is the average wavelength of the
source, about how many photons are emitted per
second? (h 6.63 x 10-34 J-s, c 3 x 108 m/s
and 1 nm 10-9 m)

1. 1017
2. 1021
3. 1025

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19
Consider a hollow body with a small hole in one
side. If this is a black body, it must?

1. be filled with gas.
2. emit no light.
3. have black paint on the walls.
4. contain electromagnetic radiation.

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20
What is the de Broglie wavelength of an electron
accelerated from rest through a potential
difference of 50 V? (h 6.63 x 10-34 J-s, me
9.11 x 10-31 kg and 1 eV 1.67 x 10-19 J)

1. 1.04 x 10-10 m
2. 1.39 x 10-10 m
3. 1.74 x 10-10 m
4. 8.34 x 10-10 m

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21
X-rays of wavelength of 0.0650 nm undergo Compton
scattering from free electrons in carbon. What is
the wavelength of photons scattered at 90
relative to the incident beam? (h 6.63 x 10-34
J-s, me 9.11 x 10-31 kg, c 3 x 108 m/s and 1
nm 10-9 m)

1. 0.0024 nm
2. 0.0674 nm
3. 0.0687 nm
4. 0.0626 nm

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22
In regard to the Compton scattering experiment
with X-rays incident upon a carbon block, as the
scattering angle becomes larger, what happens to
the magnitude of difference between the incident
and scattered wavelengths?

1. increases
2. decreases
3. remains constant
4. difference is maximum at 45 angle of scatter

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23
Which of the following statements best describes
the relation between the quantum theory and the
photoelectric effect experiment?

1. quantum theory explains photoelectric effect
2. photoelectric effect contradicts quantum theory
3. quantum theory has no bearing on photoelectric
   effect
4. photoelectric effect explains quantum theory

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24
The sun's surface temperature is 5800 K and the
peak wavelength in its radiation is 500 nm. What
is the surface temperature of a distant star
where the peak wavelength is 475 nm?

1. 5510 K
2. 5626 K
3. 6105 K
4. 6350 K

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25
Light of wavelength 480 nm is incident on a
metallic surface with a resultant photoelectric
stopping potential of 0.55 V. What is the work
function of the metal? (h 6.63 x 10-34 J-s, c
3 x 108 m/s, 1 eV 1.6 x 10-19 J and 1 nm 10-9
m)

1. 2.04 eV
2. 3.19 eV
3. 2.59 eV
4. 0.55 eV

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26
If the minimum X-ray wavelength produced is 13.5
x 10-12 m, through what potential are the
electrons accelerated in order to generate this
radiation? (h 6.63 x 10-34 J-s, c 3 x 108 m/s
and 1 eV 1.6 x 10-19 J)

1. 33,000 V
2. 46,040 V
3. 75,000 V
4. 92,080 V

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27
According to Wien's displacement law, if the
absolute temperature of a radiating blackbody is
tripled, then the peak wavelength emitted will
change by what factor?

1. 1/3
2. 1.0
3. 3.0
4. 9.0

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28
Blue light (? 460 nm) is incident on a piece of
potassium (Ø 2.2 eV). What is the maximum
kinetic energy of the ejected photoelectrons? (h
6.626 x 10-34 J-s, c 3 x 108 m/s, 1 eV 1.6
x 10-19 J)

1. 1.0 eV
2. 0.5 eV
3. 0.25 eV
4. 4.9 eV

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29
What is the energy of a photon whose frequency is
6 x 1020 Hz? (h 6.63 x 10-34 J-s and 1 eV 1.6
x 10-19 J)

1. 1.6 MeV
2. 2.5 MeV
3. 3.3 MeV
4. 4.8 MeV

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30
A quantum of radiation has an energy of 2 keV.
What is its frequency? (h 6.63 x 10-34 J-s and
1 eV 1.6 x 10-19 J)

1. 3.2 x 1017 Hz
2. 4.8 x 1017 Hz
3. 6.3 x 1017 Hz
4. 7.3 x 1017 Hz

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31
If a quantum of radiation has an energy of 2 keV,
what is its wavelength? (h 6.63 x 10-34 J-s, 1
eV 1.6 x 10-19 J, c 3 x 108 m/s and 1 nm
10-9 m)

1. 0.32 nm
2. 0.41 nm
3. 0.62 nm
4. 1.02 nm

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32
An ultraviolet light beam having a wavelength of
130 nm is incident on a molybdenum surface with
work function of 4.2 eV. What is the stopping
potential? (h 6.63 x 10-34 J-s, c 3 x 108
m/s, 1 eV 1.6 x 10-19 J and 1 nm 10-9 m)

1. 1.3 V
2. 3.5 V
3. 5.4 V
4. 11.9 V

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33
The Compton experiment demonstrated which of the
following when an X-ray photon collides with an
electron?

1. momentum is conserved
2. energy is conserved
3. momentum and energy are both conserved
4. wavelength of scattered photon equals that of
   incident photon

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34
An electron and a positron both of rest mass 0.57
MeV slowly drift together and annihilate into two
gamma ray photons. What is the wavelength of each
of the photons?

1. 1.21 x 10-12 m
2. 2.43 x 10-12 m
3. 4.86 x 10-12 m
4. 9.72 x 10-12 m

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35
A proton (mass 1.67 x 10-27 kg) has a kinetic
energy of 1 MeV. If its momentum is measured with
an uncertainty of 1, what is the minimum
uncertainty in its position? (h 6.626 x 10-34
J-s)

1. 9.08 x 10-13 m
2. 2.28 x 10-13 m
3. 9.08 x 10-14 m
4. 5.64 x 10-14 m

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36
An electron microscope operates with electrons of
kinetic energy 40 keV. What is the wavelength of
these electrons? (h 6.626 x 10-34 J-s, 1 eV
1.6 x 10-19 J, and me 9.1 x 10-31 kg)

1. 0.50 x 10-10 m
2. 7.17 x 10-11 m
3. 6.14 x 10-12 m
4. 3.07 x 10-13 m

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37
How much energy (in eV) does a photon of red
light ( ? 640 nm) have? (h 6.626 x 10-34 J-s
and 1 eV 1.6 x 10-19 J)

1. 3.2 eV
2. 2.5 eV
3. 1.9 eV
4. 1.3 eV

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38
In an X-ray diffraction experiment, using X-rays
of wavelength ? 0.5 x 10-10 m, a first-order
maximum occurred at 5 off the crystal plane.
Find the distance d between crystal planes.

1. 2.87 x 10-10 m
2. 1.36 x 10-10 m
3. 6.24 x 10-9 m
4. 1.93 x 10-9 m

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39
What is the maximum velocity of a photoelectron
emitted from a surface with work function 5 eV
when illuminated by 200 nm ultraviolet light?
(melectron 9.1 x 10-31 kg, h 6.626 x 10-34
J-s, 1 eV 1.6 x 10-19 J)

1. 800,080 m/s
2. 652,800 m/s
3. 431,100 m/s
4. 212,200 m/s

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40
A helium-neon laser emits red light having a
wavelength of 632.8 nm and a power of 0.5 mW. How
many photons are emitted each second? (h 6.626
x 10-34 J-s)

1. 1.6 x 1015
2. 3.3 x 1016
3. 4.8 x 1017
4. 2.6 x 1018

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41
What speed does a 0.06 kg golf ball have if its
de Broglie wavelength is 4.28 x 10-34 m?

1. 15 m/s
2. 26 m/s
3. 31 m/s
4. 48 m/s

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42
The electron microscope's main advantage over the
optical microscope is which of the following?

1. greater ease of portability
2. dispenses with need for a lens
3. higher power lens used
4. higher resolution possible

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43
The wave function as derived in Schrodinger's
equation is best described as being a measure of
which of the following?

1. photon beam frequency
2. photon wavelength
3. particle wavelength
4. probability

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44
What is the de Broglie wavelength for a proton (m
1.67 x 10-27 kg) moving at a speed of 5.0 x 105
m/s? (h 6.63 x 10-34 J-s)

1. 1.1 x 10-12 m
2. 0.42 x 10-12 m
3. 1.8 x 10-12 m
4. 0.79 x 10-12 m

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45
What is the minimum X-ray wavelength produced
when electrons are accelerated through a
potential of 50,000 V? (h 6.63 x 10-34 J-s, c
3 x 108 m/s and 1 eV 1.6 x 10-19 J)

1. 12.4 x 10-12 m
2. 16.5 x 10-12 m
3. 19.8 x 10-12 m
4. 24.9 x 10-12 m

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46
A monochromatic light beam is incident on a
barium target which has a work function of 2.50
eV. If a stopping potential of 1.0 V is required,
what is the light beam wavelength? (h 6.63 x
10-34 J-s, c 3 x 108 m/s, 1 eV 1.6 x 10-19 J
and 1 nm 10-9 m)

1. 355 nm
2. 497 nm
3. 744 nm
4. 1421 nm

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47
Light of wavelength 450 nm is incident on a
target metal which has a work function of 1.8 eV.
What stopping potential is required for this
combination in a phototube? (h 6.63 x 10-34
J-s, c 3 x 108 m/s, 1 eV 1.6 x 10-19 J and 1
nm 10-9 m)

1. 0.57 V
2. 0.96 V
3. 2.76 V
4. 4.56 V

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48
If barium has a work function of 2.60 eV, what is
its cutoff wavelength when used as a phototube
target? (h 6.63 x 10-34 J-s, c 3 x 108 m/s, 1
eV 1.6 x 10-19 J and 1 nm 10-9 m)

1. 398 nm
2. 477 nm
3. 497 nm
4. 596 nm

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49
A monochromatic light beam is incident on a
barium target, which has a work function of 2.50
eV. If a stopping potential of 1.0 V is required,
what is the light beam photon energy?

1. 1.0 eV
2. 1.5 eV
3. 2.5 eV
4. 3.5 eV

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50
According to Heisenberg, as the uncertainty in
the measurement of a particle's position is
reduced by a factor of 3, by what factor is the
uncertainty in that same particle's momentum
changed?

1. 1/3
2. 1.0
3. 3.0
4. 9.0

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51
What is the frequency of monochromatic light
where the photon energy is 4.0 x 10-19 J? (h
6.63 x 10-34 J-s)

1. 3.2 x 1014 Hz
2. 4.4 x 1014 Hz
3. 6.0 x 1014 Hz
4. 6.8 x 1014 Hz

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52
What is the wavelength of a monochromatic light
beam, where the photon energy is 5.0 x 10-19 J?
(h 6.63 x 10-34 J-s, c 3 x 108 m/s and 1 nm
10-9 m)

1. 354 nm
2. 398 nm
3. 414 nm
4. 787 nm

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53
What is the wavelength of a monochromatic light
beam where the photon energy is 2.0 eV? (h 6.63
x 10-34 J-s, c 3 x 108 m/s, 1 nm 10-9 m and 1
eV 1.6 x 10-19 J)

1. 414 nm
2. 621 nm
3. 746 nm
4. 829 nm

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54
According to de Broglie, as the momentum of a
moving particle is tripled, the corresponding
wavelength changes by what factor?

1. 1/9
2. 1/3
3. 3.0
4. 9.0

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55
If the measured momentum of an electron is 3.20 x
10-27 kg-m/s with an uncertainty of 1.6 x 10-29
kg-m/s, what is the minimum uncertainty in the
determination of its position? (h 6.63 x 10-34
J-s)

1. 2.6 x 10-8 m
2. 3.3 x 10-6 m
3. 0.63 x 10-4 m
4. 1.1 x 10-3 m

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56
As the temperature of a radiation emitting
blackbody becomes higher, what happens to the
peak wavelength of the radiation?

1. increases
2. decreases
3. remains constant
4. is directly proportional to temperature

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57
According to Einstein, what is true of the
stopping potential for a photoelectric current as
the wavelength of incident light becomes shorter?

1. increases
2. decreases
3. remains constant
4. stopping potential is directly proportional to
   wavelength

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58
According to Einstein, what is true of the work
function of a target material in a phototube as
the wavelength of the incident monochromatic
light beam becomes shorter?

1. increases
2. decreases
3. remains constant
4. work function is directly proportional to
   wavelength

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59
According to the de Broglie hypothesis, which of
the following statements is applicable to the
wavelength of a moving particle?

1. directly proportional to its energy
2. directly proportional to its momentum
3. inversely proportional to its energy
4. inversely proportional to its momentum

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