Question 1

The energy of the photon depends on its .

Accepted Answer

frequency ...

Question 2

What do gamma rays, X- rays, light, and radio waves all have in common?

Accepted Answer

While they vary widely in wave...

Question 3

Why would a hotter star appear blue- white while a cooler star appear red or not be visible at all?

Accepted Answer

Stefan's law notes that the higher the t...

Question 4

Knowing the peak emission wavelength of a blackbody allows you to determine its
.

Accepted Answer

The answer of Knowing the peak emission wavelength of a...

Question 5

A jar filled with gas is placed directly in front of a second jar filled with gas. Using a spectroscope to look at one jar through the other you observe dark spectral lines. The jar closest to you contains

Accepted Answer

A)   gas at the same temperature as the other jar.
B)   the cooler gas.
C)   gas at very high pressure.
D)   the hotter gas.
E)   the exact same gas as the other jar.F) B) and E)
G) A) and E)

Question 6

A wave with a frequency of 2 Hz will have a period of .

Accepted Answer

one- half ...

Question 7

Why do we know that the red Balmer emission line in hydrogen represents a smaller quantum leap than the violet line?

Accepted Answer

Red light has a longer wavelength than v...

Question 8

If a star was the same size as our Sun, but was 81 times more luminous, it must be

Accepted Answer

A)   twice as hot as our Sun.
B)   three times hotter than the Sun.
C)   four times hotter than the Sun.
D)   nine times hotter than the Sun.
E)   81 times hotter than the Sun.F) A) and B)
G) B) and C)

Question 9

Doubling the temperature of a blackbody will double the total energy it radiates.

Accepted Answer

A) True 
 B)False

Question 10

The frequency of a water wave gives us its height.

Accepted Answer

A) True 
 B)False

Question 11

Electromagnetic radiation

Accepted Answer

A)   has only the properties of waves.
B)   can behave both as a wave and as a particle.
C)   can only travel in a dense medium.
D)   is the same as a sound wave.
E)   has nothing in common with radio waves.F) D) and E)
G) A) and B)

Question 12

Wave energy can only be transmitted through a material medium.

Accepted Answer

A) True 
 B)False

Question 13

Stefan's law notes that total energy radiated is proportional to the _ power of the temperature of the blackbody.

Accepted Answer

The answer of Stefan's law notes that total energy radiated...

Question 14

According to Wein's law, the higher the surface temperature of a star, the redder its color.

Accepted Answer

A) True 
 B)False

Question 15

If a wave's frequency doubles and its speed stays constant, its wavelength

Accepted Answer

A)   is now 4× longer.
B)   is halved.
C)   is also doubled.
D)   becomes 16× longer.
E)   is unchanged, as c is constant.F) All of the above
G) A) and B)

Question 16

Which of these is the same for all forms of electromagnetic (E- M)  radiation in a vacuum?

Accepted Answer

A)   frequency
B)   wavelength
C)   speed
D)   amplitude
E)   photon energyF) B) and D)
G) None of the above

Question 17

The distance from a wave's crest to its undisturbed position is the _ .

Accepted Answer

The answer of The distance from a wave's crest to...

Question 18

No one can hear you scream (or fire a weapon) in space, regardless of the Hollywood special effects. Explain why.

Accepted Answer

Sound waves must travel though...

Question 19

The broader the spectral line, the higher the pressure of the gas that is creating it.

Accepted Answer

A) True 
 B)False

Question 20

Spectroscopy of a star can reveal its temperature, composition, and line- of- sight motion.

Accepted Answer

A) True 
 B)False

Exam 3: Light and Matter: the Inner Workings of the Cosmos

Why would a hotter star appear blue- white while a cooler star appear red or not be visible at all?

Correct AnswerverifiedStefan's law notes that the higher the t...View AnswerShow Answer

Which of these is the same for all forms of electromagnetic (E- M) radiation in a vacuum?

Correct AnswerverifiedShow Answer

The distance from a wave's crest to its undisturbed position is the _ .

Correct AnswerverifiedShow Answer

If a wave's frequency doubles and its speed stays constant, its wavelength

Correct AnswerverifiedShow Answer

No one can hear you scream (or fire a weapon) in space, regardless of the Hollywood special effects. Explain why.

Correct AnswerverifiedSound waves must travel though...View AnswerShow Answer

A jar filled with gas is placed directly in front of a second jar filled with gas. Using a spectroscope to look at one jar through the other you observe dark spectral lines. The jar closest to you contains

Correct AnswerverifiedShow Answer

Knowing the peak emission wavelength of a blackbody allows you to determine its .

Correct AnswerverifiedShow Answer

The frequency of a water wave gives us its height.

Correct AnswerverifiedShow Answer

What do gamma rays, X- rays, light, and radio waves all have in common?

Correct AnswerverifiedWhile they vary widely in wave...View AnswerShow Answer

Electromagnetic radiation

Correct AnswerverifiedShow Answer

The energy of the photon depends on its .

Correct Answerverifiedfrequency ...View AnswerShow Answer

Stefan's law notes that total energy radiated is proportional to the _ power of the temperature of the blackbody.

Correct AnswerverifiedShow Answer

Wave energy can only be transmitted through a material medium.

Correct AnswerverifiedShow Answer

A wave with a frequency of 2 Hz will have a period of .

Correct Answerverifiedone- half ...View AnswerShow Answer

Spectroscopy of a star can reveal its temperature, composition, and line- of- sight motion.

Correct AnswerverifiedShow Answer

Doubling the temperature of a blackbody will double the total energy it radiates.

Correct AnswerverifiedShow Answer

Why do we know that the red Balmer emission line in hydrogen represents a smaller quantum leap than the violet line?

Correct AnswerverifiedRed light has a longer wavelength than v...View AnswerShow Answer

If a star was the same size as our Sun, but was 81 times more luminous, it must be

Correct AnswerverifiedShow Answer

According to Wein's law, the higher the surface temperature of a star, the redder its color.

Correct AnswerverifiedShow Answer

The broader the spectral line, the higher the pressure of the gas that is creating it.

Correct AnswerverifiedShow Answer

Correct Answer
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Stefan's law notes that the higher the t...
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Sound waves must travel though...
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While they vary widely in wave...
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frequency ...
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one- half ...
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Red light has a longer wavelength than v...
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