Quiz 9
1) In the spectrum of white light which one of the following colors corresponds to the highest temperature?
A) Yellow
B) Violet
C) Green
D) Red
Answer: B
2) Which one of the following is true regarding the energy of a photon?
A) It depends upon the intensity.
B) It depends upon its amplitude.
C) It depends upon its frequency.
D) It depends upon its velocity.
Answer: C
3) A beam of light with a frequency range of 3.01 × 1014 Hz - 6.10 × 1014 Hz is incident on a metal surface. If the
work function of the metal surface is 2.20 eV, what is the maximum kinetic energy of photoelectrons ejected from
this surface?
A) 0.32 eV
B) 0.21 eV
C) 0.42 eV
D) 0.16 eV
Answer: A
4) A beam of white light of a certain frequency is incident on a metal surface. If the work function of this surface is
2.20 eV, what frequency of light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected
from this surface?
A) 2.05 × 1014 Hz
B) 1.02 × 1014 Hz
C) 2.50 × 1014 Hz
D) 5.92 × 1014 Hz
Answer: D
5) What is the momentum of a photon of light that has a frequency of 3.7 × 1014 Hz?
A) 1.5 × 10-28 kgm/s
B) 2.1 × 10-28 kgm/s
C) 4.4 × 10-28 kgm/s
D) 8.2 × 10-28 kgm/s
Answer: D
6) A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the
incident direction. If the wavelength of the incident photon is 0.611 nm, what is the wavelength of the scattered
photon?
A) 0.380 nm
B) 0 nm
C) 0.611 nm
D) 0.615 nm
Answer: D
7) Protons are being accelerated in a particle accelerator. When the speed of the protons is doubled, their de Broglie
wavelength will
A) increase by a factor of 2.
B) decrease by a factor of 2.
C) increase by a factor of 2 .
D) decrease by a factor of
Answer: B
2.
8) A proton and an electron are both accelerated to the same final kinetic energy. If λp is the de Broglie wavelength
of the proton and λe is the de Broglie wavelength of the electron, then
A) λp > λe.
B) λp = λe.
C) λp < λe.
D) Not enough data to answer this question.
Answer: C
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