Question 1

The hottest star is the star that glows

Accepted Answer

A) red. 
B) white. 
C) blue. 
D) cannot be determined by color alone 
A) red. 
B) white. 
C) blue. 
D) cannot be determined by color alone C

Question 2

Electrons with the greater potential energies with respect to the atomic nucleus are

Accepted Answer

A) inner electrons. 
B) outer electrons. 
C) both the same,actually 
A) inner electrons. 
B) outer electrons. 
C) both the same,actually B

Question 3

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. B

Question 4

An atom that emits a certain frequency of light is

Accepted Answer

A) not likely to absorb that same frequency. 
B) an absorber of the same frequency. 
A) not likely to absorb that same frequency. 
B) an absorber of the same frequency.

Question 5

Spectral lines take the shape of vertical lines because

Accepted Answer

A) the light is vertically polarized. 
B) they are simply images of a vertical slit. 
C) the energy levels in the atom are parallel to one another. 
D) all of these 
E) none of these 
A) the light is vertically polarized. 
B) they are simply images of a vertical slit. 
C) the energy levels in the atom are parallel to one another. 
D) all of these 
E) none of these

Question 6

An excited atom is an atom

Accepted Answer

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

Question 7

Compared to the energy of a photon of red light,the energy of a photon of blue light is

Accepted Answer

A) less. 
B) more. 
C) the same. 
A) less. 
B) more. 
C) the same.

Question 8

Which of the following continually emits electromagnetic radiation?

Accepted Answer

A) insects 
B) radio antennas 
C) red-hot coals 
D) all of these 
E) none of these 
A) insects 
B) radio antennas 
C) red-hot coals 
D) all of these 
E) none of these

Question 9

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

Accepted Answer

A) is fluorescent. 
B) is phosphorescent. 
C) is used in lasers. 
D) is polarized. 
E) doesn't exist. 
A) is fluorescent. 
B) is phosphorescent. 
C) is used in lasers. 
D) is polarized. 
E) doesn't exist.

Question 10

The Doppler effect from the back-and-forth motion of atoms in a glowing discharge tube tends to make the spectral lines slightly

Accepted Answer

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

Question 11

Which light source is more energy-efficient?

Accepted Answer

A) a fluorescent lamp 
B) an incandescent lamp 
C) both about the same 
A) a fluorescent lamp 
B) an incandescent lamp 
C) both about the same

Question 12

Helium was first discovered in the

Accepted Answer

A) laboratory. 
B) upper atmosphere. 
C) sun. 
D) island of Helios,in Greece. 
E) by-products of nuclear fusion. 
A) laboratory. 
B) upper atmosphere. 
C) sun. 
D) island of Helios,in Greece. 
E) by-products of nuclear fusion.

Question 13

The highest frequency light of those below 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 14

Atoms of neon in a glass tube can be excited

Accepted Answer

A) once per atom. 
B) over and over again. 
A) once per atom. 
B) over and over again.

Question 15

A throbbing pulse of electromagnetic radiation is called a

Accepted Answer

A) proton. 
B) photon. 
C) lightron. 
D) sparktron. 
E) notron. 
A) proton. 
B) photon. 
C) lightron. 
D) sparktron. 
E) notron.

Question 16

The radiation curve for a "blue hot" object peaks in the

Accepted Answer

A) infrared region. 
B) red region. 
C) yellow region. 
D) ultraviolet region. 
E) none of these 
A) infrared region. 
B) red region. 
C) yellow region. 
D) ultraviolet region. 
E) none of these

Question 17

Sometimes a flashlight filament glows red instead of white.This indicates a lowness of

Accepted Answer

A) current in the filament. 
B) battery strength. 
C) filament temperature. 
D) all of these 
E) none of these 
A) current in the filament. 
B) battery strength. 
C) filament temperature. 
D) all of these 
E) none of these

Question 18

Astronomers can tell whether a star is approaching or receding from Earth by

Accepted Answer

A) its temperature. 
B) its change in temperature. 
C) its absorption spectra. 
D) the Doppler effect. 
E) all of these 
A) its temperature. 
B) its change in temperature. 
C) its absorption spectra. 
D) the Doppler effect. 
E) all of these

Question 19

Discrete spectral lines occur when excitation takes place in a

Accepted Answer

A) solid. 
B) liquid. 
C) gas. 
D) superconductor. 
E) all of these 
A) solid. 
B) liquid. 
C) gas. 
D) superconductor. 
E) all of these

Question 20

Ultraviolet light is

Accepted Answer

A) more energetic than X-rays. 
B) produced by crossed Polaroids. 
C) electromagnetic energy. 
D) present everywhere. 
E) none of these 
A) more energetic than X-rays. 
B) produced by crossed Polaroids. 
C) electromagnetic energy. 
D) present everywhere. 
E) none of these

Exam 30: Light Emission

The hottest star is the star that glows

Electrons with the greater potential energies with respect to the atomic nucleus are

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

An atom that emits a certain frequency of light is

Spectral lines take the shape of vertical lines because

An excited atom is an atom

Compared to the energy of a photon of red light,the energy of a photon of blue light is

Which of the following continually emits electromagnetic radiation?

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

The Doppler effect from the back-and-forth motion of atoms in a glowing discharge tube tends to make the spectral lines slightly

Which light source is more energy-efficient?

Helium was first discovered in the

The highest frequency light of those below is

Atoms of neon in a glass tube can be excited

A throbbing pulse of electromagnetic radiation is called a

The radiation curve for a "blue hot" object peaks in the

Sometimes a flashlight filament glows red instead of white.This indicates a lowness of

Astronomers can tell whether a star is approaching or receding from Earth by

Discrete spectral lines occur when excitation takes place in a

Ultraviolet light is

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