Question 1

An atom that absorbs a photon of a certain energy can then emit

Accepted Answer

A) only a photon of that energy. 
B) a photon of any energy. 
C) only a photon of the same or higher energy. 
D) only a photon of the same or lower energy. 
A) only a photon of that energy. 
B) a photon of any energy. 
C) only a photon of the same or higher energy. 
D) only a photon of the same or lower energy.

Question 2

A photographer wishes to use a safety light in the darkroom that will emit low-energy photons.The best visible color to use is

Accepted Answer

A) violet. 
B) blue. 
C) green. 
D) actually any of these 
E) none of these 
A) violet. 
B) blue. 
C) green. 
D) actually any of these 
E) none of these

Question 3

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 4

To say that energy levels in an atom are discrete is to say the energy levels are well defined and

Accepted Answer

A) separate from one another. 
B) separated from one another by the same energy increments. 
C) continuous. 
D) private. 
A) separate from one another. 
B) separated from one another by the same energy increments. 
C) continuous. 
D) private.

Question 5

For absorption spectra to exist

Accepted Answer

A) the light source must be a gas. 
B) partially absorbent material must exist between the light source and spectroscope. 
C) the spectroscope must be equipped with an absorption cell. 
D) all of these 
E) none of these 
A) the light source must be a gas. 
B) partially absorbent material must exist between the light source and spectroscope. 
C) the spectroscope must be equipped with an absorption cell. 
D) all of these 
E) none of these

Question 6

Light from a laser is

Accepted Answer

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

Question 7

A certain object emits infrared waves.If it were to emit light waves instead,its temperature would have to be

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 8

A watch dial that continues to glow after a week in the dark is almost certainly

Accepted Answer

A) fluorescent. 
B) phosphorescent. 
C) polarized. 
D) radioactive. 
A) fluorescent. 
B) phosphorescent. 
C) polarized. 
D) radioactive.

Question 9

If light in a spectroscope were passed through a star-shaped opening instead of a thin slit,spectral lines would appear as

Accepted Answer

A) lines,but with poorer resolution. 
B) stars. 
C) blobs of no definite shape. 
A) lines,but with poorer resolution. 
B) stars. 
C) blobs of no definite shape.

Question 10

Light from two closely spaced stars will not produce a steady interference pattern at the Earth's surface because of

Accepted Answer

A) incoherence. 
B) the inherent instability of the atmosphere. 
C) their different radial distances. 
D) their non-point like natures. 
E) Closely spaced stars do produce interference patterns. 
A) incoherence. 
B) the inherent instability of the atmosphere. 
C) their different radial distances. 
D) their non-point like natures. 
E) Closely spaced stars do produce interference patterns.

Question 11

If the radiation curve for an incandescent object 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 12

The variety of colors seen in a burning log comes from the variety of

Accepted Answer

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

Question 13

The white light emitted by a fluorescent lamp is provided by the

Accepted Answer

A) mercury vapor in the lamp. 
B) phosphors on the inner surface of the lamp. 
C) high temperature of the glowing gas. 
D) filtering effect of the glass tubing. 
A) mercury vapor in the lamp. 
B) phosphors on the inner surface of the lamp. 
C) high temperature of the glowing gas. 
D) filtering effect of the glass tubing.

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) violates the law of energy conservation. 
D) all of these 
E) none of these 
A) occurs in plants. 
B) occurs in the process of phosphorescence. 
C) violates the law of energy conservation. 
D) all of these 
E) none of these

Question 15

Light is emitted when an electron

Accepted Answer

A) is boosted to a higher energy level. 
B) makes a transition to a lower energy level. 
C) neither of these 
A) is boosted to a higher energy level. 
B) makes a transition to a lower energy level. 
C) neither of these

Question 16

Light frequency from an incandescent lamp depends on the

Accepted Answer

A) amount of electrical energy transformed. 
B) rate of atomic and molecular vibrations. 
C) voltage applied to the lamp. 
D) electrical resistance of the lamp. 
E) transparency of glass. 
A) amount of electrical energy transformed. 
B) rate of atomic and molecular vibrations. 
C) voltage applied to the lamp. 
D) electrical resistance of the lamp. 
E) transparency of glass.

Question 17

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 18

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

Accepted Answer

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

Question 19

The fact that iron absorption lines occur in the solar spectrum directly indicates that there is iron in the solar

Accepted Answer

A) atmosphere. 
B) surface. 
C) interior. 
A) atmosphere. 
B) surface. 
C) interior.

Question 20

No laser can emit more energy than is put into it.Can a laser emit more power than is put into it?

Accepted Answer

A) No. 
B) Yes,although not continuously. 
C) It is too early in our technological development to answer this question with a reasonable degree of certainty. 
A) No. 
B) Yes,although not continuously. 
C) It is too early in our technological development to answer this question with a reasonable degree of certainty.

Exam 30: Light Emission

An atom that absorbs a photon of a certain energy can then emit

A photographer wishes to use a safety light in the darkroom that will emit low-energy photons.The best visible color to use is

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

To say that energy levels in an atom are discrete is to say the energy levels are well defined and

For absorption spectra to exist

Light from a laser is

A certain object emits infrared waves.If it were to emit light waves instead,its temperature would have to be

A watch dial that continues to glow after a week in the dark is almost certainly

If light in a spectroscope were passed through a star-shaped opening instead of a thin slit,spectral lines would appear as

Light from two closely spaced stars will not produce a steady interference pattern at the Earth's surface because of

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

The variety of colors seen in a burning log comes from the variety of

The white light emitted by a fluorescent lamp is provided by the

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

Light is emitted when an electron

Light frequency from an incandescent lamp depends on the

Fluorescent minerals on display in museums are illuminated with

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

The fact that iron absorption lines occur in the solar spectrum directly indicates that there is iron in the solar

No laser can emit more energy than is put into it.Can a laser emit more power than is put into it?

About Science

Newtons First Law of Motion: Inertia

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Newtons Third Law of Motion: Action and Reaction

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Atomic Nature of Matter

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Temperature,heat,and Expansion

Heat Transfer

Change of Phase

Thermodynamics

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Electromagnetic Induction

Properties of Light

Color

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Special Theory of Relativity

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