Question 1

Two photons have the same wavelength.They also have the same

Accepted Answer

A) frequency. 
B) energy. 
C) both of these 
D) neither of these 
A) frequency. 
B) energy. 
C) both of these 
D) neither of these

Question 2

Which of the following are conserved when a photon collides with an electron?

Accepted Answer

A) momentum,energy,and velocity 
B) momentum and energy 
C) momentum and velocity 
D) energy and velocity 
E) None of the above choices are correct. 
A) momentum,energy,and velocity 
B) momentum and energy 
C) momentum and velocity 
D) energy and velocity 
E) None of the above choices are correct.

Question 3

Which of the following has the longer wavelength?

Accepted Answer

A) a low-energy electron 
B) a high-energy electron 
C) Both have the same wavelength. 
A) a low-energy electron 
B) a high-energy electron 
C) Both have the same wavelength.

Question 4

The phenomenon that can be explained only in terms of the particle model of light is

Accepted Answer

A) reflection. 
B) refraction. 
C) photoelectric effect. 
D) diffraction. 
E) None of the above choices are correct. 
A) reflection. 
B) refraction. 
C) photoelectric effect. 
D) diffraction. 
E) None of the above choices are correct.

Question 5

The more information one has about the energy of an electron,the less certain one is about

Accepted Answer

A) its position. 
B) the time it has that energy. 
C) both of these 
D) neither of these 
A) its position. 
B) the time it has that energy. 
C) both of these 
D) neither of these

Question 6

Two beams of light,a red beam and a blue beam,have the same energy.The beam with the greater number of photons is the

Accepted Answer

A) red beam. 
B) blue beam. 
C) both the same 
A) red beam. 
B) blue beam. 
C) both the same

Question 7

In the photoelectric effect,doubling the frequency of incident light will cause the maximum energy of ejected electrons to

Accepted Answer

A) double. 
B) increase,but not double. 
C) more than double. 
D) decrease. 
A) double. 
B) increase,but not double. 
C) more than double. 
D) decrease.

Question 8

Light behaves primarily as a particle when it

Accepted Answer

A) travels from one place to another. 
B) interacts with matter. 
A) travels from one place to another. 
B) interacts with matter.

Question 9

Which of the following forms an interference pattern when directed toward two suitably spaced slits?

Accepted Answer

A) light 
B) sound 
C) electrons 
D) all of these 
E) none of these 
A) light 
B) sound 
C) electrons 
D) all of these 
E) none of these

Question 10

The ratio of the energy of a photon to its frequency is

Accepted Answer

A) pi. 
B) Planck's constant. 
C) the photon's speed. 
D) the photon's wavelength. 
E) not known. 
A) pi. 
B) Planck's constant. 
C) the photon's speed. 
D) the photon's wavelength. 
E) not known.

Question 11

In the photoelectric effect,electrons ejected from bound states in the photosensitive material have

Accepted Answer

A) less kinetic energy than the absorbed photon's energy. 
B) more kinetic energy than the absorbed photon's energy. 
C) kinetic energy equal to the absorbed photon's energy. 
A) less kinetic energy than the absorbed photon's energy. 
B) more kinetic energy than the absorbed photon's energy. 
C) kinetic energy equal to the absorbed photon's energy.

Question 12

Which has less energy per photon?

Accepted Answer

A) red light 
B) blue light 
C) Both have the same energy. 
A) red light 
B) blue light 
C) Both have the same energy.

Question 13

The ratio of a photon's energy to its frequency is

Accepted Answer

A) its speed. 
B) its wavelength. 
C) its amplitude. 
D) Planck's constant. 
E) none of these 
A) its speed. 
B) its wavelength. 
C) its amplitude. 
D) Planck's constant. 
E) none of these

Question 14

According to the uncertainty principle,the more we know about a particle's momentum,the less we know about its

Accepted Answer

A) kinetic energy. 
B) mass. 
C) speed. 
D) location. 
E) none of these 
A) kinetic energy. 
B) mass. 
C) speed. 
D) location. 
E) none of these

Question 15

When a clean surface of potassium metal is exposed to blue light,electrons are emitted.If the intensity of the blue light is increased,which of the following will also increase?

Accepted Answer

A) the number of electrons ejected per second 
B) the maximum kinetic energy of the ejected electrons 
C) the threshold frequency of the ejected electrons 
D) the time lag between the absorption of blue light and the start of emission of the electrons 
E) none of these 
A) the number of electrons ejected per second 
B) the maximum kinetic energy of the ejected electrons 
C) the threshold frequency of the ejected electrons 
D) the time lag between the absorption of blue light and the start of emission of the electrons 
E) none of these

Question 16

In the relationship E = hf for a photon emitted from an atom,the symbol E is used to represent the energy

Accepted Answer

A) of the emitted photon. 
B) difference between atomic energy states producing the photon. 
C) both of these 
D) neither of these 
A) of the emitted photon. 
B) difference between atomic energy states producing the photon. 
C) both of these 
D) neither of these

Question 17

In the double-slit experiment with electrons,the electrons arrive at the screen in a

Accepted Answer

A) particle-like way with a pattern that is particle-like. 
B) particle-like way with a pattern that is wave-like. 
C) wave-like way with a pattern that is particle-like. 
D) wave-like way with a pattern that is wave-like. 
A) particle-like way with a pattern that is particle-like. 
B) particle-like way with a pattern that is wave-like. 
C) wave-like way with a pattern that is particle-like. 
D) wave-like way with a pattern that is wave-like.

Question 18

Which of the following is not quantized?

Accepted Answer

A) energy 
B) radiation 
C) number of people in a room 
D) electric charge 
E) All are quantized. 
A) energy 
B) radiation 
C) number of people in a room 
D) electric charge 
E) All are quantized.

Question 19

A radiation detector measures the radioactivity of a piece of radium by catching and counting alpha particles it emits.According to quantum physics,making this measurement affects the

Accepted Answer

A) radiation rate of the piece of radium. 
B) alpha particles that are caught. 
C) both of these 
D) neither of these 
A) radiation rate of the piece of radium. 
B) alpha particles that are caught. 
C) both of these 
D) neither of these

Question 20

A photosensitive surface is illuminated with both blue and violet light.The light that will cause the most electrons to be ejected is the

Accepted Answer

A) blue light. 
B) violet light. 
C) Both eject the same number. 
D) not enough information given 
A) blue light. 
B) violet light. 
C) Both eject the same number. 
D) not enough information given

Exam 31: Light Quanta

Two photons have the same wavelength.They also have the same

Which of the following are conserved when a photon collides with an electron?

Which of the following has the longer wavelength?

The phenomenon that can be explained only in terms of the particle model of light is

The more information one has about the energy of an electron,the less certain one is about

Two beams of light,a red beam and a blue beam,have the same energy.The beam with the greater number of photons is the

In the photoelectric effect,doubling the frequency of incident light will cause the maximum energy of ejected electrons to

Light behaves primarily as a particle when it

Which of the following forms an interference pattern when directed toward two suitably spaced slits?

The ratio of the energy of a photon to its frequency is

In the photoelectric effect,electrons ejected from bound states in the photosensitive material have

Which has less energy per photon?

The ratio of a photon's energy to its frequency is

According to the uncertainty principle,the more we know about a particle's momentum,the less we know about its

When a clean surface of potassium metal is exposed to blue light,electrons are emitted.If the intensity of the blue light is increased,which of the following will also increase?

In the relationship E = hf for a photon emitted from an atom,the symbol E is used to represent the energy

In the double-slit experiment with electrons,the electrons arrive at the screen in a

Which of the following is not quantized?

A radiation detector measures the radioactivity of a piece of radium by catching and counting alpha particles it emits.According to quantum physics,making this measurement affects the

A photosensitive surface is illuminated with both blue and violet light.The light that will cause the most electrons to be ejected is the

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