Question 1

If a material is heated until it is green hot, then

Accepted Answer

A) it would liquefy immediately. 
B) it would be hotter than white hot. 
C) its molecules would be vibrating at nearly identical rates. 
D) it would be a strong absorber of red light. 
E) energy conservation would be violated. 
A) it would liquefy immediately. 
B) it would be hotter than white hot. 
C) its molecules would be vibrating at nearly identical rates. 
D) it would be a strong absorber of red light. 
E) energy conservation would be violated. C

Question 2

The red laser beam from a helium-neon laser corresponds to a spectral line of

Accepted Answer

A) helium. 
B) neon. 
C) both of these 
D) neither of these 
A) helium. 
B) neon. 
C) both of these 
D) neither of these B

Question 3

Light from a laser is

Accepted Answer

A) monochromatic. 
B) in phase. 
C) coherent. 
D) all of the above 
E) none of the above 
A) monochromatic. 
B) in phase. 
C) coherent. 
D) all of the above 
E) none of the above D

Question 4

If the energy levels in the neon atom were not discrete, neon signs would glow

Accepted Answer

A) red. 
B) white. 
C) blue. 
A) red. 
B) white. 
C) blue.

Question 5

Astronomers can detect the spin rates of stars by

Accepted Answer

A) their temperature. 
B) changes in temperature. 
C) absorption spectra. 
D) the Doppler effect. 
E) all of the above 
A) their temperature. 
B) changes in temperature. 
C) absorption spectra. 
D) the Doppler effect. 
E) all of the above

Question 6

White-light LEDs employ

Accepted Answer

A) phosphors. 
B) white-emitting diodes. 
C) extra-high electrical barriers. 
D) none of the above 
A) phosphors. 
B) white-emitting diodes. 
C) extra-high electrical barriers. 
D) none of the above

Question 7

The radiation curve for a red hot fire-place poker peaks in the

Accepted Answer

A) infrared region. 
B) green region. 
C) ultraviolet region. 
A) infrared region. 
B) green region. 
C) ultraviolet region.

Question 8

The highest frequency of visible light is

Accepted Answer

A) red. 
B) green. 
C) blue. 
D) violet. 
E) all the same 
A) red. 
B) green. 
C) blue. 
D) violet. 
E) all the same

Question 9

A violet-hot star emits radiation having about twice the peak frequency of radiation from a red-hot star. The surface temperature of the hotter star is about

Accepted Answer

A) half that of the cooler star. 
B) twice that of the cooler star. 
C) the same. 
A) half that of the cooler star. 
B) twice that of the cooler star. 
C) the same.

Question 10

An atom is excited when one or more of its electrons

Accepted Answer

A) vibrates. 
B) is boosted into higher energy levels. 
C) undergoes a frequency change. 
D) becomes frantic. 
A) vibrates. 
B) is boosted into higher energy levels. 
C) undergoes a frequency change. 
D) becomes frantic.

Question 11

If a certain object emits visible waves rather than infrared waves its temperature is

Accepted Answer

A) higher. 
B) lower. 
C) the same, temperature doesn't make any difference. 
A) higher. 
B) lower. 
C) the same, temperature doesn't make any difference.

Question 12

An object heated to twice the absolute temperature emits radiation

Accepted Answer

A) with twice the peak frequency. 
B) in the ultraviolet part of the spectrum. 
C) in the radio wave part of the spectrum. 
D) with longer wavelengths. 
A) with twice the peak frequency. 
B) in the ultraviolet part of the spectrum. 
C) in the radio wave part of the spectrum. 
D) with longer wavelengths.

Question 13

A paint pigment that absorbs blue light and gives off red light

Accepted Answer

A) is fluorescent. 
B) is phosphorescent. 
C) can be both of these 
D) neither of these 
A) is fluorescent. 
B) is phosphorescent. 
C) can be both of these 
D) neither of these

Question 14

If light in a spectroscope passed through round holes instead of slits, spectral lines would appear

Accepted Answer

A) as thicker lines. 
B) round. 
C) dimmer. 
A) as thicker lines. 
B) round. 
C) dimmer.

Question 15

If the radiation curve for an incandescent lamp filament peaks in the green region, the object would appear

Accepted Answer

A) red. 
B) yellow. 
C) green. 
D) blue. 
E) white. 
A) red. 
B) yellow. 
C) green. 
D) blue. 
E) white.

Question 16

Comparing the light from a glowing tube of neon gas and the beam of a helium-neon laser, there is a greater number of spectral lines in light from the

Accepted Answer

A) neon gas tube. 
B) laser beam. 
C) both about the same 
A) neon gas tube. 
B) laser beam. 
C) both about the same

Question 17

Physicists find that the energy states of atoms are

Accepted Answer

A) discrete. 
B) circular. 
C) elliptical. 
D) chaotic. 
A) discrete. 
B) circular. 
C) elliptical. 
D) chaotic.

Question 18

In the process of fluorescence, part of the input energy immediately

Accepted Answer

A) becomes internal energy with the rest as lower-frequency light. 
B) cascades to excite other atoms in the material. 
C) is emitted as higher-frequency light and the rest as lower-frequency light. 
D) excites electrons to metastable states. 
E) none of the above 
A) becomes internal energy with the rest as lower-frequency light. 
B) cascades to excite other atoms in the material. 
C) is emitted as higher-frequency light and the rest as lower-frequency light. 
D) excites electrons to metastable states. 
E) none of the above

Question 19

Atoms can be excited by

Accepted Answer

A) thermal agitation. 
B) electron impact. 
C) photon impact. 
D) all of the above 
E) none of the above 
A) thermal agitation. 
B) electron impact. 
C) photon impact. 
D) all of the above 
E) none of the above

Question 20

A radio wave and a visible light wave differ only in

Accepted Answer

A) frequency. 
B) energy per photon. 
C) both of these 
D) none of these 
A) frequency. 
B) energy per photon. 
C) both of these 
D) none of these

Exam 30: Light Emission

If a material is heated until it is green hot, then

The red laser beam from a helium-neon laser corresponds to a spectral line of

Light from a laser is

If the energy levels in the neon atom were not discrete, neon signs would glow

Astronomers can detect the spin rates of stars by

White-light LEDs employ

The radiation curve for a red hot fire-place poker peaks in the

The highest frequency of visible light is

A violet-hot star emits radiation having about twice the peak frequency of radiation from a red-hot star. The surface temperature of the hotter star is about

An atom is excited when one or more of its electrons

If a certain object emits visible waves rather than infrared waves its temperature is

An object heated to twice the absolute temperature emits radiation

A paint pigment that absorbs blue light and gives off red light

If light in a spectroscope passed through round holes instead of slits, spectral lines would appear

If the radiation curve for an incandescent lamp filament peaks in the green region, the object would appear

Comparing the light from a glowing tube of neon gas and the beam of a helium-neon laser, there is a greater number of spectral lines in light from the

Physicists find that the energy states of atoms are

In the process of fluorescence, part of the input energy immediately

Atoms can be excited by

A radio wave and a visible light wave differ only in

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