Question 1

According to the Bohr model, the kinetic energy of an electron in a stationary state in hydrogen is what factor times its potential energy?

Accepted Answer

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

Question 2

An electron and positron, each having kinetic energy 10 MeV, annihilate and produce two photons. What is the wavelength of each photon?

Accepted Answer

A)  0.124 pm 
B)  0.118 pm 
C)  0.248 pm 
D)  0.062 pm 
E)  need more information 
A)  0.124 pm 
B)  0.118 pm 
C)  0.248 pm 
D)  0.062 pm 
E)  need more information

Question 3

Which scientist proposed quantization of energy to overcome a major problem with understanding blackbody radiation?

Accepted Answer

A)  Heinrich Hertz 
B)  Max Planck 
C)  Albert Einstein 
D)  James Clerk Maxwell 
E)  Niels Bohr 
A)  Heinrich Hertz 
B)  Max Planck 
C)  Albert Einstein 
D)  James Clerk Maxwell 
E)  Niels Bohr

Question 4

The maximum shift in wavelength in Compton scattering is what multiple of the Compton wavelength (h/mec)?

Accepted Answer

A)  0.5 
B)  1 
C)  2 
D)  4 
E)  unlimited 
A)  0.5 
B)  1 
C)  2 
D)  4 
E)  unlimited

Question 5

Using the quantum theory of EM waves, which scientist was successful in explaining the photoelectric effect (and later won a Nobel Prize for the work)?

Accepted Answer

A)  Heinrich Hertz 
B)  Max Planck 
C)  Albert Einstein 
D)  James Clerk Maxwell 
E)  Niels Bohr 
A)  Heinrich Hertz 
B)  Max Planck 
C)  Albert Einstein 
D)  James Clerk Maxwell 
E)  Niels Bohr

Question 6

Silver has a work function of 4.73 eV. Photons of the threshold frequency would be described as which of the following?

Accepted Answer

A)  infrared 
B)  red 
C)  yellow 
D)  blue 
E)  ultraviolet 
A)  infrared 
B)  red 
C)  yellow 
D)  blue 
E)  ultraviolet

Question 7

The Compton shift equation for the change in wavelength of a scattered photon is derived from the law(s) of

Accepted Answer

A)  conservation of momentum. 
B)  conservation of energy. 
C)  conservation of charge. 
D)  conservation of momentum and charge. 
E)  conservation of energy and momentum. 
A)  conservation of momentum. 
B)  conservation of energy. 
C)  conservation of charge. 
D)  conservation of momentum and charge. 
E)  conservation of energy and momentum.

Question 8

What is the ionization energy of the hydrogen atom in the n = 2 state?

Accepted Answer

A)  13.6 eV 
B)  −13.6 eV 
C)  3.40 eV 
D)  −3.40 eV 
E)  −1.51 eV 
A)  13.6 eV 
B)  −13.6 eV 
C)  3.40 eV 
D)  −3.40 eV 
E)  −1.51 eV

Question 9

According to the Bohr model, what is the kinetic energy of an electron in the ground state of hydrogen?

Accepted Answer

A)  0 
B)  13.6 eV 
C)  6.80 eV 
D)  27.2 eV 
E)  1.88 eV 
A)  0 
B)  13.6 eV 
C)  6.80 eV 
D)  27.2 eV 
E)  1.88 eV

Question 10

Light with the wavelength of peak intensity from a star can just barely produce photoelectrons from manganese (φ = 4.1 eV). What is the temperature of the star?

Accepted Answer

A)  960 K 
B)  23000 K 
C)  9600 K 
D)  96000 K 
E)  2300 K 
A)  960 K 
B)  23000 K 
C)  9600 K 
D)  96000 K 
E)  2300 K

Question 11

What is the highest energy of a photon in the Balmer series?

Accepted Answer

A)  1.89 eV 
B)  3.40 eV 
C)  1.51 eV 
D)  0.94 eV 
E)  0.66 eV 
A)  1.89 eV 
B)  3.40 eV 
C)  1.51 eV 
D)  0.94 eV 
E)  0.66 eV

Question 12

Sodium has a work function of 2.36 eV. Of the following choices, which is the one of the longest wavelength that could cause photoelectrons to be ejected from the sodium?

Accepted Answer

A)  300 nm 
B)  400 nm 
C)  500 nm 
D)  600 nm 
E)  700 nm 
A)  300 nm 
B)  400 nm 
C)  500 nm 
D)  600 nm 
E)  700 nm

Question 13

In a photoelectric effect experiment, light of a single wavelength is incident on the metal surface. As the intensity of the incident light is increased

Accepted Answer

A)  the stopping potential decreases. 
B)  the stopping potential increases. 
C)  the work function decreases. 
D)  the work function increases. 
E)  None of these choices are true. 
A)  the stopping potential decreases. 
B)  the stopping potential increases. 
C)  the work function decreases. 
D)  the work function increases. 
E)  None of these choices are true.

Question 14

What is the ratio of the Bohr orbital radius for hydrogen in the n = 3 state to that in the n = 1 state?

Accepted Answer

A)  1/3 
B)  3 
C)  6 
D)  9 
E)  18 
A)  1/3 
B)  3 
C)  6 
D)  9 
E)  18

Exam 27: Early Quantum Physics and the Photon

According to the Bohr model, the kinetic energy of an electron in a stationary state in hydrogen is what factor times its potential energy?

An electron and positron, each having kinetic energy 10 MeV, annihilate and produce two photons. What is the wavelength of each photon?

Which scientist proposed quantization of energy to overcome a major problem with understanding blackbody radiation?

The maximum shift in wavelength in Compton scattering is what multiple of the Compton wavelength (h/mec)?

Using the quantum theory of EM waves, which scientist was successful in explaining the photoelectric effect (and later won a Nobel Prize for the work)?

Silver has a work function of 4.73 eV. Photons of the threshold frequency would be described as which of the following?

The Compton shift equation for the change in wavelength of a scattered photon is derived from the law(s) of

What is the ionization energy of the hydrogen atom in the n = 2 state?

According to the Bohr model, what is the kinetic energy of an electron in the ground state of hydrogen?

Light with the wavelength of peak intensity from a star can just barely produce photoelectrons from manganese (φ = 4.1 eV). What is the temperature of the star?

What is the highest energy of a photon in the Balmer series?

Sodium has a work function of 2.36 eV. Of the following choices, which is the one of the longest wavelength that could cause photoelectrons to be ejected from the sodium?

In a photoelectric effect experiment, light of a single wavelength is incident on the metal surface. As the intensity of the incident light is increased

What is the ratio of the Bohr orbital radius for hydrogen in the n = 3 state to that in the n = 1 state?

Introduction

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The maximum shift in wavelength in Compton scattering is what multiple of the Compton wavelength (h/m_ec)?