Question 1

Which light-emitting process is characterized by an afterglow?

Accepted Answer

A) incandescence. 
B) fluorescence. 
C) phosphorescence. 
D) resonance. 
E) none of the above 
A) incandescence. 
B) fluorescence. 
C) phosphorescence. 
D) resonance. 
E) none of the above

Question 2

Neon atoms in a glass tube can be excited

Accepted Answer

A) once per atom. 
B) repeatedly. 
C) by infrared light. 
A) once per atom. 
B) repeatedly. 
C) by infrared light.

Question 3

An excited atom is an atom

Accepted Answer

A) with excess vibration. 
B) with one or more displaced electrons. 
C) with more protons than electrons. 
D) that is frantic. 
A) with excess vibration. 
B) with one or more displaced electrons. 
C) with more protons than electrons. 
D) that is frantic.

Question 4

The energy of a photon is related to

Accepted Answer

A) the energy given to the atom that emits it. 
B) the energy transition in de-excitation. 
C) its frequency. 
D) all of the above 
E) none of the above 
A) the energy given to the atom that emits it. 
B) the energy transition in de-excitation. 
C) its frequency. 
D) all of the above 
E) none of the above

Question 5

The best visible safety light in the darkroom that will emit low-energy photons is

Accepted Answer

A) violet. 
B) blue. 
C) green. 
D) any of the above 
E) none of the above 
A) violet. 
B) blue. 
C) green. 
D) any of the above 
E) none of the above

Question 6

Some light switches that glow in the dark after the lights are turned off employ

Accepted Answer

A) fluorescence. 
B) resonance. 
C) incandescence. 
D) all of the above 
E) none of the above 
A) fluorescence. 
B) resonance. 
C) incandescence. 
D) all of the above 
E) none of the above

Question 7

As the filament of a lamp is heated it changes

Accepted Answer

A) temperature. 
B) color. 
C) both of these 
D) neither of these 
A) temperature. 
B) color. 
C) both of these 
D) neither of these

Question 8

Sometimes a flashlight filament glows red instead of white, which indicates a lowness of

Accepted Answer

A) current in the filament. 
B) filament temperature. 
C) both of these 
D) neither of these 
A) current in the filament. 
B) filament temperature. 
C) both of these 
D) neither of these

Question 9

The air that you breathe doesn't emit visible light indicates that most of the electrons of its atoms are

Accepted Answer

A) in the ground state. 
B) excited to metastable states. 
C) relatively cool. 
D) electrically neutral. 
E) relatively far apart. 
A) in the ground state. 
B) excited to metastable states. 
C) relatively cool. 
D) electrically neutral. 
E) relatively far apart.

Question 10

Fraunhofer lines are apparent in

Accepted Answer

A) absorption spectra. 
B) emission spectra. 
C) Doppler shifts. 
D) a variety of energy levels. 
E) none of the above 
A) absorption spectra. 
B) emission spectra. 
C) Doppler shifts. 
D) a variety of energy levels. 
E) none of the above

Question 11

Fluorescent minerals on display in museums are illuminated with

Accepted Answer

A) infrared light. 
B) ultraviolet light. 
C) often either or both 
D) none of these 
A) infrared light. 
B) ultraviolet light. 
C) often either or both 
D) none of these

Question 12

Iron absorption lines that occur in the solar spectrum indicate that iron exists in the solar

Accepted Answer

A) atmosphere. 
B) surface. 
C) interior. 
D) none of the above 
A) atmosphere. 
B) surface. 
C) interior. 
D) none of the above

Question 13

If wavelengths of emitted light become longer, the energy per photon of light

Accepted Answer

A) increases. 
B) remains constant. 
C) decreases. 
D) none of the above 
A) increases. 
B) remains constant. 
C) decreases. 
D) none of the above

Question 14

The absorption of an infrared photon that excites an atom to emit a green photon

Accepted Answer

A) occurs in plants. 
B) occurs in the process of phosphorescence. 
C) would violate the law of energy conservation. 
D) all of the above 
E) none of the above 
A) occurs in plants. 
B) occurs in the process of phosphorescence. 
C) would violate the law of energy conservation. 
D) all of the above 
E) none of the above

Question 15

The spectral lines are more distinct when viewed in a mercury vapor lamp under

Accepted Answer

A) high pressure. 
B) low pressure. 
C) same for each 
A) high pressure. 
B) low pressure. 
C) same for each

Question 16

Compared to the energy put into a laser, the energy of the laser beam is

Accepted Answer

A) usually much more. 
B) much less. 
C) the same. 
D) none of the above 
A) usually much more. 
B) much less. 
C) the same. 
D) none of the above

Question 17

The Doppler effect due to motion of excited atoms in a glowing gas tends to make the spectral lines slightly

Accepted Answer

A) thicker. 
B) thinner. 
C) more numerous. 
D) none of the above 
A) thicker. 
B) thinner. 
C) more numerous. 
D) none of the above

Question 18

Light from a lit match originates with accelerating

Accepted Answer

A) electrons. 
B) protons. 
C) neutrons. 
D) all of the above 
A) electrons. 
B) protons. 
C) neutrons. 
D) all of the above

Question 19

Colors seen in the flames of a burning log originate with the variety of

Accepted Answer

A) multi-layered incandescent surfaces. 
B) electron transitions in various atoms. 
C) temperatures. 
D) absorbing gases between the log and the viewer. 
A) multi-layered incandescent surfaces. 
B) electron transitions in various atoms. 
C) temperatures. 
D) absorbing gases between the log and the viewer.

Question 20

The energy per photon in ultraviolet light is greater than in

Accepted Answer

A) radio waves. 
B) microwaves. 
C) visible light. 
D) all of the above 
E) none of the above 
A) radio waves. 
B) microwaves. 
C) visible light. 
D) all of the above 
E) none of the above

Exam 30: Light Emission

Which light-emitting process is characterized by an afterglow?

Neon atoms in a glass tube can be excited

An excited atom is an atom

The energy of a photon is related to

The best visible safety light in the darkroom that will emit low-energy photons is

Some light switches that glow in the dark after the lights are turned off employ

As the filament of a lamp is heated it changes

Sometimes a flashlight filament glows red instead of white, which indicates a lowness of

The air that you breathe doesn't emit visible light indicates that most of the electrons of its atoms are

Fraunhofer lines are apparent in

Fluorescent minerals on display in museums are illuminated with

Iron absorption lines that occur in the solar spectrum indicate that iron exists in the solar

If wavelengths of emitted light become longer, the energy per photon of light

The absorption of an infrared photon that excites an atom to emit a green photon

The spectral lines are more distinct when viewed in a mercury vapor lamp under

Compared to the energy put into a laser, the energy of the laser beam is

The Doppler effect due to motion of excited atoms in a glowing gas tends to make the spectral lines slightly

Light from a lit match originates with accelerating

Colors seen in the flames of a burning log originate with the variety of

The energy per photon in ultraviolet light is greater than in

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