Question 1

(x)is the wave function for a particle moving along the x axis.The probability that the particle is in the interval from x = a to x = b is given by:

Accepted Answer

A)   
B)   
C)   
D)  " " 
E)  " " 
A)   
B)   
C)   
D)  " " 
E)  " "

Question 2

In Compton scattering from stationary electrons the largest change in wavelength that can occur is:

Accepted Answer

A) 2.43 *10-15 m 
B) 2.43 *10-12 m 
C) 2.43 * 10-9 m 
D) dependent on the frequency of the incident light 
E) dependent on the work function 
A) 2.43 *10-15 m 
B) 2.43 *10-12 m 
C) 2.43 * 10-9 m 
D) dependent on the frequency of the incident light 
E) dependent on the work function

Question 3

In order to tunnel through a potential barrier a particle must:

Accepted Answer

A) have energy greater than the barrier height 
B) have spin 
C) be massive 
D) have a wavelength longer than the barrier width 
E) none of the above 
A) have energy greater than the barrier height 
B) have spin 
C) be massive 
D) have a wavelength longer than the barrier width 
E) none of the above

Question 4

The intensity of a light beam with a wavelength of 500 nm is 2000 W/m2.The photon flux is about:

Accepted Answer

A) 5 * 1017 /m2.s 
B) 5 * 1019 /m2.s 
C) 5 * 1021 /m2.s 
D) 5 F*1023 /m2.s 
E) 5 * 1025 /m2.s 
A) 5 * 1017 /m2.s 
B) 5 * 1019 /m2.s 
C) 5 * 1021 /m2.s 
D) 5 F*1023 /m2.s 
E) 5 * 1025 /m2.s

Question 5

An electron with energy E is incident on a potential energy barrier of height Epot and thickness L.The probability of tunneling increases if:

Accepted Answer

A) E decreases without any other changes 
B) Epot increases without any other changes 
C) L decreases without any other changes 
D) E and Epot increase by the same amount 
E) E and Epot decrease by the same amount 
A) E decreases without any other changes 
B) Epot increases without any other changes 
C) L decreases without any other changes 
D) E and Epot increase by the same amount 
E) E and Epot decrease by the same amount

Question 6

In a photoelectric effect experiment no electrons are ejected if the frequency of the incident light is less than A/h, where h is the Planck constant and A is:

Accepted Answer

A) the maximum energy needed to eject the least energetic electron 
B) the minimum energy needed to eject the least energetic electron 
C) the maximum energy needed to eject the most energetic electron 
D) the minimum energy needed to eject the most energetic electron 
E) the intensity of the incident light 
A) the maximum energy needed to eject the least energetic electron 
B) the minimum energy needed to eject the least energetic electron 
C) the maximum energy needed to eject the most energetic electron 
D) the minimum energy needed to eject the most energetic electron 
E) the intensity of the incident light

Question 7

Of the following, Compton scattering from electrons is most easily observed for:

Accepted Answer

A) microwaves 
B) infrared light 
C) visible light 
D) ultraviolet light 
E) x rays 
A) microwaves 
B) infrared light 
C) visible light 
D) ultraviolet light 
E) x rays

Question 8

The diagram shows the graphs of the stopping potential as a function of the frequency of the incident light for photoelectric experiments performed on three different materials.Rank the materials according to the values of their work functions, from least to greatest.

Accepted Answer

A) 1, 2, 3 
B) 3, 2, 1 
C) 2, 3, 1 
D) 2, 1, 3 
E) 1, 3, 2 
A) 1, 2, 3 
B) 3, 2, 1 
C) 2, 3, 1 
D) 2, 1, 3 
E) 1, 3, 2

Question 9

The quantization of energy, E = nhf, is not important for an ordinary pendulum because:

Accepted Answer

A) the formula applies only to mass-spring oscillators 
B) the allowed energy levels are too closely spaced 
C) the allowed energy levels are too widely spaced 
D) the formula applies only to atoms 
E) the value of h for a pendulum is too large 
A) the formula applies only to mass-spring oscillators 
B) the allowed energy levels are too closely spaced 
C) the allowed energy levels are too widely spaced 
D) the formula applies only to atoms 
E) the value of h for a pendulum is too large

Question 10

Monoenergetic electrons are incident on a single slit barrier.If the energy of each incident electron is increased the central maximum of the diffraction pattern:

Accepted Answer

A) widens 
B) narrows 
C) stays the same width 
D) widens for slow electrons and narrows for fast electrons 
E) narrows for slow electrons and widens for fast electrons 
A) widens 
B) narrows 
C) stays the same width 
D) widens for slow electrons and narrows for fast electrons 
E) narrows for slow electrons and widens for fast electrons

Question 11

If the kinetic energy of a non-relativistic free electron doubles, the frequency of its wave function changes by the factor:

Accepted Answer

A) 1/   
B) 1/2 
C) 1/4 
D)    
E) 2 
A) 1/   
B) 1/2 
C) 1/4 
D)    
E) 2

Question 12

An electron with energy E is incident upon a potential energy barrier of height Epot < E and thickness L.The reflection coefficient R:

Accepted Answer

A) is always equal to zero 
B) is always equal to 1 
C) does not depend on E - Epot 
D) is, in general, not equal to zero 
E) is equal to T + 1 where T is the transmission coefficient 
A) is always equal to zero 
B) is always equal to 1 
C) does not depend on E - Epot 
D) is, in general, not equal to zero 
E) is equal to T + 1 where T is the transmission coefficient

Question 13

The surface of the Sun is at a temperature of approximately 5800 K, and radiates a peak wavelength of 500 nm.According to the Planck radiation law, what is its emitted intensity per unit wavelength at the peak?

Accepted Answer

A) 8.4 W/cm2∙nm 
B) 42 W/cm2∙nm 
C) 84 W/cm2∙nm 
D) 8.4 x 103 W/cm2∙nm 
E) 4.2 x 107 W/cm2∙nm 
A) 8.4 W/cm2∙nm 
B) 42 W/cm2∙nm 
C) 84 W/cm2∙nm 
D) 8.4 x 103 W/cm2∙nm 
E) 4.2 x 107 W/cm2∙nm

Question 14

Electromagnetic radiation with a wavelength of 3.5 * 10-12 m is scattered from stationary electrons, and photons that have been scattered through 50° are detected.After a scattering event the magnitude of the photon's momentum is:

Accepted Answer

A) 0 kg.m/s 
B) 8.7*10-23 kg.m/s 
C) 1.5 * 10-22 kg.m/s 
D) 2.0*10-22 kg.m/s 
E) 2.2 * 10-22 kg.m/s 
A) 0 kg.m/s 
B) 8.7*10-23 kg.m/s 
C) 1.5 * 10-22 kg.m/s 
D) 2.0*10-22 kg.m/s 
E) 2.2 * 10-22 kg.m/s

Question 15

Rank following electromagnetic radiations according to the energies of their photons, from least to greatest.

Accepted Answer

A) 1, 2, 3, 4 
B) 4, 2, 1, 3 
C) 4, 1, 2, 3 
D) 3, 2, 1, 4 
E) 3, 1, 2, 4 
A) 1, 2, 3, 4 
B) 4, 2, 1, 3 
C) 4, 1, 2, 3 
D) 3, 2, 1, 4 
E) 3, 1, 2, 4

Question 16

The units of the Planck constant h are those of:

Accepted Answer

A) energy 
B) power 
C) momentum 
D) angular momentum 
E) frequency 
A) energy 
B) power 
C) momentum 
D) angular momentum 
E) frequency

Question 17

The reflection coefficient R for a certain barrier tunneling problem is 0.80.The corresponding transmission coefficient T is:

Accepted Answer

A) 0.80 
B) 0.60 
C) 0.50 
D) 0.20 
E) 0 
A) 0.80 
B) 0.60 
C) 0.50 
D) 0.20 
E) 0

Question 18

Consider the following: I.A photoelectric process in which all emitted electrons have energy less than hf, where f is the frequency of the incident light.
II.A photoelectric process in which some emitted electrons have kinetic energy greater than hf.
III.Compton scattering from stationary electrons for which the emitted light has a frequency that is greater than that of the incident light.
IV.Compton scattering from stationary electrons for which the emitted light has a frequency that is less than that of the incident light.
The only possible processes are:

Accepted Answer

A) I 
B) III 
C) I and III 
D) I and IV 
E) II and IV 
A) I 
B) III 
C) I and III 
D) I and IV 
E) II and IV

Question 19

Consider the following three particles:   Rank them according to the wavelengths of their matter waves, least to greatest.

Accepted Answer

A) 1, 2, 3 
B) 3, 2, 1 
C) 2, 3, 1 
D) 1, 3, 2 
E) 1, then 2 and 3 tied 
A) 1, 2, 3 
B) 3, 2, 1 
C) 2, 3, 1 
D) 1, 3, 2 
E) 1, then 2 and 3 tied

Question 20

The wavelength of light beam B is twice the wavelength of light beam B.The energy of a photon in beam A is:

Accepted Answer

A) one-fourth the energy of a photon in beam B 
B) half the energy of photon in beam B 
C) equal to the energy of a photon in beam B 
D) twice energy of a photon in beam B 
E) four times the energy of a photon in beam B 
A) one-fourth the energy of a photon in beam B 
B) half the energy of photon in beam B 
C) equal to the energy of a photon in beam B 
D) twice energy of a photon in beam B 
E) four times the energy of a photon in beam B

Exam 38: Photons and Matter Waves

(x)is the wave function for a particle moving along the x axis.The probability that the particle is in the interval from x = a to x = b is given by:

In Compton scattering from stationary electrons the largest change in wavelength that can occur is:

In order to tunnel through a potential barrier a particle must:

The intensity of a light beam with a wavelength of 500 nm is 2000 W/m2.The photon flux is about:

An electron with energy E is incident on a potential energy barrier of height Epot and thickness L.The probability of tunneling increases if:

In a photoelectric effect experiment no electrons are ejected if the frequency of the incident light is less than A/h, where h is the Planck constant and A is:

Of the following, Compton scattering from electrons is most easily observed for:

The diagram shows the graphs of the stopping potential as a function of the frequency of the incident light for photoelectric experiments performed on three different materials.Rank the materials according to the values of their work functions, from least to greatest.

The quantization of energy, E = nhf, is not important for an ordinary pendulum because:

Monoenergetic electrons are incident on a single slit barrier.If the energy of each incident electron is increased the central maximum of the diffraction pattern:

If the kinetic energy of a non-relativistic free electron doubles, the frequency of its wave function changes by the factor:

An electron with energy E is incident upon a potential energy barrier of height Epot < E and thickness L.The reflection coefficient R:

The surface of the Sun is at a temperature of approximately 5800 K, and radiates a peak wavelength of 500 nm.According to the Planck radiation law, what is its emitted intensity per unit wavelength at the peak?

Electromagnetic radiation with a wavelength of 3.5 * 10-12 m is scattered from stationary electrons, and photons that have been scattered through 50° are detected.After a scattering event the magnitude of the photon's momentum is:

Rank following electromagnetic radiations according to the energies of their photons, from least to greatest.

The units of the Planck constant h are those of:

The reflection coefficient R for a certain barrier tunneling problem is 0.80.The corresponding transmission coefficient T is:

Consider the following three particles: Rank them according to the wavelengths of their matter waves, least to greatest.

The wavelength of light beam B is twice the wavelength of light beam B.The energy of a photon in beam A is:

Measurement

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Vectors

Motion in Two and Three Dimensions

Force and Motion

Force and Motion

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

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Equilibrium and Elasticity

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Waves

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The Kinetic Theory of Gases

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Coulombs Law

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Interference 1

Diffraction

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Conduction of Electricity in Solids

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters

The intensity of a light beam with a wavelength of 500 nm is 2000 W/m².The photon flux is about:

An electron with energy E is incident on a potential energy barrier of height E_pot and thickness L.The probability of tunneling increases if:

An electron with energy E is incident upon a potential energy barrier of height E_pot < E and thickness L.The reflection coefficient R:

Electromagnetic radiation with a wavelength of 3.5 * 10^-12 m is scattered from stationary electrons, and photons that have been scattered through 50° are detected.After a scattering event the magnitude of the photon's momentum is: