Question 1

What is the surface temperature of a star, given that its radiation peak occurs at a frequency of 1.86 × 1015 Hz?

Accepted Answer

A) 17,000 K 
B) 14,500 K 
C) 19,000 K 
D) 20,400 K 
E) 18,000 K 
A) 17,000 K 
B) 14,500 K 
C) 19,000 K 
D) 20,400 K 
E) 18,000 K

Question 2

The energy of the ground state in the Bohr model is -13.6 eV. In a transition from the n = 2 state to the n = 4 state, a photon of energy

Accepted Answer

A) 3.40 eV is emitted. 
B) 3.40 eV is absorbed. 
C) 2.55 eV is absorbed. 
D) 2.55 eV is emitted. 
E) 0.85 eV is emitted. 
A) 3.40 eV is emitted. 
B) 3.40 eV is absorbed. 
C) 2.55 eV is absorbed. 
D) 2.55 eV is emitted. 
E) 0.85 eV is emitted.

Question 3

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?

Accepted Answer

A) 2.05 × 1014 Hz 
B) 1.02 × 1014 Hz 
C) 2.50 × 1014 Hz 
D) 3.53 × 1014 Hz 
E) 5.92 × 1014 Hz 
A) 2.05 × 1014 Hz 
B) 1.02 × 1014 Hz 
C) 2.50 × 1014 Hz 
D) 3.53 × 1014 Hz 
E) 5.92 × 1014 Hz

Question 4

One star appears blue-white while another appears yellow-orange. If this is caused by temperature difference, then

Accepted Answer

A) the stars are the same brightness. 
B) the yellow-orange star is hotter. 
C) the blue-white star is brighter. 
D) the blue-white star is hotter. 
E) the yellow-orange star is brighter. 
A) the stars are the same brightness. 
B) the yellow-orange star is hotter. 
C) the blue-white star is brighter. 
D) the blue-white star is hotter. 
E) the yellow-orange star is brighter.

Question 5

What is the number of photons per second given off by a light bulb with a power of 100 Watts operating at an efficiency of 4.80%? Assume the wavelength of light to be 600 nm.

Accepted Answer

A) 6.34 × 1018 photons/s 
B) 5.42 × 1018 photons/s 
C) 3.11 × 1018 photons/s 
D) 25.3 × 1018 photons/s 
E) 14.5 × 1018 photons/s 
A) 6.34 × 1018 photons/s 
B) 5.42 × 1018 photons/s 
C) 3.11 × 1018 photons/s 
D) 25.3 × 1018 photons/s 
E) 14.5 × 1018 photons/s

Question 6

The work function of a certain metal is 1.90 eV. What is the longest wavelength of light that can cause photoelectron emission from this metal?

Accepted Answer

A) 231 nm 
B) 14.0 nm 
C) 62.4 nm 
D) 344 nm 
E) 653 nm 
A) 231 nm 
B) 14.0 nm 
C) 62.4 nm 
D) 344 nm 
E) 653 nm

Question 7

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

Accepted Answer

A) 1.0 × 106 m/s 
B) 1.3 × 106 m/s 
C) 7.0 × 105 m/s 
D) 7.7 × 105 m/s 
E) 3.5 × 106 m/s 
A) 1.0 × 106 m/s 
B) 1.3 × 106 m/s 
C) 7.0 × 105 m/s 
D) 7.7 × 105 m/s 
E) 3.5 × 106 m/s

Question 8

Light with a frequency of 8.70 × 1014 Hz is incident on a metal that has a work function of 2.8 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?

Accepted Answer

A) 8.71 × 10-19 J 
B) 3.11 × 10-19 J 
C) 1.28 × 10-19 J 
D) 2.41 × 10-19 J 
E) 4.52 × 10-19 J 
A) 8.71 × 10-19 J 
B) 3.11 × 10-19 J 
C) 1.28 × 10-19 J 
D) 2.41 × 10-19 J 
E) 4.52 × 10-19 J

Question 9

The Balmer series in hydrogen

Accepted Answer

A) includes the Lyman series. 
B) includes both the Paschen series and the Lyman series. 
C) includes the Paschen series. 
D) has four lines in the ultraviolet. 
E) has four lines in the visible. 
A) includes the Lyman series. 
B) includes both the Paschen series and the Lyman series. 
C) includes the Paschen series. 
D) has four lines in the ultraviolet. 
E) has four lines in the visible.

Question 10

The Compton effect demonstrates

Accepted Answer

A) relativistic formulation works well. 
B) consistent explanations of scattered photon shift in wavelength. 
C) light acts as photons. 
D) all of the above. 
E) none of the above. 
A) relativistic formulation works well. 
B) consistent explanations of scattered photon shift in wavelength. 
C) light acts as photons. 
D) all of the above. 
E) none of the above.

Question 11

The rest mass of a photon is zero.

Accepted Answer

A) True 
 B)False

Question 12

What is the de Broglie wavelength of an electron whose kinetic energy is 1.0 eV?

Accepted Answer

A) 520 nm 
B) 8.2 nm 
C) 0.64 nm 
D) 52 nm 
E) 1.2 nm 
A) 520 nm 
B) 8.2 nm 
C) 0.64 nm 
D) 52 nm 
E) 1.2 nm

Question 13

The energy of the ground state in the Bohr model is -13.6 eV. The energy of the n = 2 is

Accepted Answer

A) -3.4 eV. 
B) -6.8 eV. 
C) -1.7 eV. 
D) -13.6 eV. 
E) -4.5 eV. 
A) -3.4 eV. 
B) -6.8 eV. 
C) -1.7 eV. 
D) -13.6 eV. 
E) -4.5 eV.

Question 14

The behavior of blackbody radiation was poorly explained until ________ produced an adequate theory.

Accepted Answer

A) Wien 
B) Bohr 
C) Planck 
D) Jeans 
E) Rayleigh 
A) Wien 
B) Bohr 
C) Planck 
D) Jeans 
E) Rayleigh

Question 15

The surface temperature of the star is 6000 K. What is the wavelength associated with the light emitted by this star?

Accepted Answer

A) 483 nm 
B) 907 nm 
C) 311 nm 
D) 492 nm 
E) 502 nm 
A) 483 nm 
B) 907 nm 
C) 311 nm 
D) 492 nm 
E) 502 nm

Question 16

What scattering angle in the Compton effect produces the minimum change in frequency?

Accepted Answer

A) 45° 
B) 90° 
C) 0° 
D) 180° 
E) 270° 
A) 45° 
B) 90° 
C) 0° 
D) 180° 
E) 270°

Question 17

A photon of wavelength 1.50 × 10-10 m is scattered at an angle of 90° in the Compton effect. The wavelength of the scattered photon is

Accepted Answer

A) 1.52 × 10-10 m 
B) 1.49 × 10-10 m 
C) 1.48 × 10-10 m 
D) 1.51 × 10-10 m 
E) 1.50 × 10-10 m 
A) 1.52 × 10-10 m 
B) 1.49 × 10-10 m 
C) 1.48 × 10-10 m 
D) 1.51 × 10-10 m 
E) 1.50 × 10-10 m

Question 18

In the Compton effect, if a photon is scattered at a particular angle, the resulting shift in wavelength for the scattered photon

Accepted Answer

A) is the same for all incident energy photons. 
B) is greater for a higher energy incident photon. 
C) depends on the wavelength of the incident photon. 
D) is never the same for incident energy photons. 
E) is less for a higher energy incident photon. 
A) is the same for all incident energy photons. 
B) is greater for a higher energy incident photon. 
C) depends on the wavelength of the incident photon. 
D) is never the same for incident energy photons. 
E) is less for a higher energy incident photon.

Question 19

If the hydrogen atom is in the n = 4 state, what is the largest number of photons that can be emitted as the atom goes back to the ground state?

Accepted Answer

A) 0 
B) 4 
C) 2 
D) 3 
E) 1 
A) 0 
B) 4 
C) 2 
D) 3 
E) 1

Question 20

What is the energy of a photon that has the same wavelength as a 100-eV electron?

Accepted Answer

A) 1000 eV 
B) 10,000 eV 
C) 100 eV 
D) 50 eV 
E) 200 eV 
A) 1000 eV 
B) 10,000 eV 
C) 100 eV 
D) 50 eV 
E) 200 eV

Exam 37: Early Quantum Theory and Models of the Atom

What is the surface temperature of a star, given that its radiation peak occurs at a frequency of 1.86 × 1015 Hz?

The energy of the ground state in the Bohr model is -13.6 eV. In a transition from the n = 2 state to the n = 4 state, a photon of energy

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?

One star appears blue-white while another appears yellow-orange. If this is caused by temperature difference, then

What is the number of photons per second given off by a light bulb with a power of 100 Watts operating at an efficiency of 4.80%? Assume the wavelength of light to be 600 nm.

The work function of a certain metal is 1.90 eV. What is the longest wavelength of light that can cause photoelectron emission from this metal?

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

Light with a frequency of 8.70 × 1014 Hz is incident on a metal that has a work function of 2.8 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?

The Balmer series in hydrogen

The Compton effect demonstrates

The rest mass of a photon is zero.

What is the de Broglie wavelength of an electron whose kinetic energy is 1.0 eV?

The energy of the ground state in the Bohr model is -13.6 eV. The energy of the n = 2 is

The behavior of blackbody radiation was poorly explained until ________ produced an adequate theory.

The surface temperature of the star is 6000 K. What is the wavelength associated with the light emitted by this star?

What scattering angle in the Compton effect produces the minimum change in frequency?

A photon of wavelength 1.50 × 10-10 m is scattered at an angle of 90° in the Compton effect. The wavelength of the scattered photon is

In the Compton effect, if a photon is scattered at a particular angle, the resulting shift in wavelength for the scattered photon

If the hydrogen atom is in the n = 4 state, what is the largest number of photons that can be emitted as the atom goes back to the ground state?

What is the energy of a photon that has the same wavelength as a 100-eV electron?

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Filters

What is the surface temperature of a star, given that its radiation peak occurs at a frequency of 1.86 × 10¹⁵ Hz?

Light with a frequency of 8.70 × 10¹⁴ Hz is incident on a metal that has a work function of 2.8 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?

A photon of wavelength 1.50 × 10^-10 m is scattered at an angle of 90° in the Compton effect. The wavelength of the scattered photon is