Question 1

In order for a photon to eject an electron from a metal's surface in the photoelectric effect, the photon's

Accepted Answer

A) frequency must be greater than a certain minimum value. 
B) speed must be greater than a certain minimum value. 
C) wavelength must be greater than a certain minimum value. 
D) momentum must be zero. 
A) frequency must be greater than a certain minimum value. 
B) speed must be greater than a certain minimum value. 
C) wavelength must be greater than a certain minimum value. 
D) momentum must be zero.

Question 2

At what frequency does an object with a temperature of 1000 K radiate the most power?

Accepted Answer

A) 1.0 × 1014 Hz 
B) 8.0 × 1014 Hz 
C) 2.3 × 1012 Hz 
D) 6.7 × 1013 Hz 
E) 4.1 × 1011 Hz 
A) 1.0 × 1014 Hz 
B) 8.0 × 1014 Hz 
C) 2.3 × 1012 Hz 
D) 6.7 × 1013 Hz 
E) 4.1 × 1011 Hz

Question 3

In a particular case of Compton scattering, a photon collides with a free electron and scatters backwards. The wavelength after the collision is exactly double the wavelength before the collision. What is the wavelength of the incident photon?

Accepted Answer

A) 3.6 × 10-12 m 
B) 4.8 × 10-12 m 
C) 2.4 × 10-12 m 
D) 1.2 × 10-12 m 
E) 6.0 × 10-12 m 
A) 3.6 × 10-12 m 
B) 4.8 × 10-12 m 
C) 2.4 × 10-12 m 
D) 1.2 × 10-12 m 
E) 6.0 × 10-12 m

Question 4

In the spectrum of a blackbody, the wavelength of peak intensity

Accepted Answer

A) decreases as temperature increases. 
B) is 0.029 m. 
C) is 0.0029 m. 
D) increases as temperature increases. 
E) is independent of temperature. 
A) decreases as temperature increases. 
B) is 0.029 m. 
C) is 0.0029 m. 
D) increases as temperature increases. 
E) is independent of temperature.

Question 5

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?

Accepted Answer

A) 0.32 eV 
B) 0.21 eV 
C) 0.42 eV 
D) 0.16 eV 
E) 0.48 eV 
A) 0.32 eV 
B) 0.21 eV 
C) 0.42 eV 
D) 0.16 eV 
E) 0.48 eV

Question 6

The de Broglie wavelength of an electron is 380 nm. What is the speed of this electron?

Accepted Answer

A) 2.04 × 103 m/s 
B) 3.83 × 103 m/s 
C) 1.92 × 103 m/s 
D) 4.12 × 103 m/s 
E) 5.22 × 103 m/s 
A) 2.04 × 103 m/s 
B) 3.83 × 103 m/s 
C) 1.92 × 103 m/s 
D) 4.12 × 103 m/s 
E) 5.22 × 103 m/s

Question 7

In the relativistic case, doubling the speed of an electron causes its wavelength to

Accepted Answer

A) double. 
B) more than double. 
C) halve. 
D) decrease to less than one-half. 
E) quadruple. 
A) double. 
B) more than double. 
C) halve. 
D) decrease to less than one-half. 
E) quadruple.

Question 8

In a Compton scattering experiment, what scattering angle produces the greatest change in wavelength?

Accepted Answer

A) 0° 
B) 45° 
C) 90° 
D) 180° 
E) none of the given answers 
A) 0° 
B) 45° 
C) 90° 
D) 180° 
E) none of the given answers

Question 9

A photon has an energy of 6.60 eV. To what wavelength does this energy correspond?

Accepted Answer

A) 100 nm 
B) 118 nm 
C) 151 nm 
D) 173 nm 
E) 189 nm 
A) 100 nm 
B) 118 nm 
C) 151 nm 
D) 173 nm 
E) 189 nm

Question 10

A surface has a work function 1.70 eV and has light of wavelength 400 nm shone on it. What is the kinetic energy of the photoelectrons emitted?

Accepted Answer

A) 4.52 eV 
B) 3.11 eV 
C) 1.41 eV 
D) 2.82 eV 
E) 1.70 eV 
A) 4.52 eV 
B) 3.11 eV 
C) 1.41 eV 
D) 2.82 eV 
E) 1.70 eV

Question 11

What is the cutoff frequency for a metal surface that has a work function of 5.42 eV?

Accepted Answer

A) 1.31 × 1015 Hz 
B) 2.01 × 1015 Hz 
C) 3.01 × 1015 Hz 
D) 5.02 × 1015 Hz 
E) 6.04 × 1015 Hz 
A) 1.31 × 1015 Hz 
B) 2.01 × 1015 Hz 
C) 3.01 × 1015 Hz 
D) 5.02 × 1015 Hz 
E) 6.04 × 1015 Hz

Question 12

The distribution of energy in the blackbody radiation depends upon the material from which the blackbody is constructed.

Accepted Answer

A) True 
 B)False

Question 13

In the non-relativistic case, doubling the speed of an electron causes its wavelength to

Accepted Answer

A) double. 
B) quadruple. 
C) halve. 
D) decrease by a factor of four. 
E) triple. 
A) double. 
B) quadruple. 
C) halve. 
D) decrease by a factor of four. 
E) triple.

Question 14

Unlike other particles, photons have a finite momentum even though they have no mass.

Accepted Answer

A) True 
 B)False

Question 15

Electrons are emitted from a surface when light of wavelength 500 nm is shone on the surface but electrons are not emitted for longer wavelengths of light. The work function of the surface is

Accepted Answer

A) 5.0 eV. 
B) 0.60 eV. 
C) 2.5 eV. 
D) 4.0 eV. 
E) 0.40 eV. 
A) 5.0 eV. 
B) 0.60 eV. 
C) 2.5 eV. 
D) 4.0 eV. 
E) 0.40 eV.

Exam 37: Early Quantum Theory and Models of the Atom

In order for a photon to eject an electron from a metal's surface in the photoelectric effect, the photon's

At what frequency does an object with a temperature of 1000 K radiate the most power?

In a particular case of Compton scattering, a photon collides with a free electron and scatters backwards. The wavelength after the collision is exactly double the wavelength before the collision. What is the wavelength of the incident photon?

In the spectrum of a blackbody, the wavelength of peak intensity

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?

The de Broglie wavelength of an electron is 380 nm. What is the speed of this electron?

In the relativistic case, doubling the speed of an electron causes its wavelength to

In a Compton scattering experiment, what scattering angle produces the greatest change in wavelength?

A photon has an energy of 6.60 eV. To what wavelength does this energy correspond?

A surface has a work function 1.70 eV and has light of wavelength 400 nm shone on it. What is the kinetic energy of the photoelectrons emitted?

What is the cutoff frequency for a metal surface that has a work function of 5.42 eV?

The distribution of energy in the blackbody radiation depends upon the material from which the blackbody is constructed.

In the non-relativistic case, doubling the speed of an electron causes its wavelength to

Unlike other particles, photons have a finite momentum even though they have no mass.

Electrons are emitted from a surface when light of wavelength 500 nm is shone on the surface but electrons are not emitted for longer wavelengths of light. The work function of the surface is

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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?