Question 1

A gas heated to millions of degrees would emit

Accepted Answer

A)  mostly radio waves.
B)  mostly X-rays.
C)  mostly ultraviolet light.
D)  an equal amount of all wavelengths of light.
E)  no light,because it is too hot.

Question 2

We can learn a lot about the properties of a star by studying its spectrum.All of the following statements are true except one.Which one?

Accepted Answer

A)  The peak of the star's thermal emission tells us its temperature: Hotter stars peak at shorter (bluer) wavelengths.
B)  The total amount of light in the spectrum tells us the star's radius.
C)  We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals.
D)  We can look at Doppler shifts of spectral lines to determine the star's speed toward or away from us.

Question 3

The frequency of a wave is

Accepted Answer

A)  the number of peaks passing by any point each second.
B)  measured in cycles per second.
C)  measured in hertz (Hz) .
D)  equal to the speed of the wave divided by the wavelength of the wave.
E)  all of the above

Question 4

The greater the wavelength of light,the greater its energy.

Accepted Answer

A) True 
 B)False

Question 5

Suppose that two stars are identical in every way-for example,same distance,same mass,same temperature,same chemical composition,and same speed relative to Earth-except that one star rotates faster than the other.Spectroscopically,how could you tell the stars apart?

Accepted Answer

A)  The faster rotating star has wider spectral lines than the slower rotating star.
B)  The faster rotating star will have an emission line spectrum while the slower rotating star will have an absorption line spectrum.
C)  The peak of thermal emission will be at a shorter wavelength for the faster rotating star than for the slower rotating star.
D)  There is no way to tell the stars apart spectroscopically,because their spectra will be identical.

Question 6

Suppose you know the frequency of a photon and the speed of light.What else can you determine about the photon?

Accepted Answer

A)  its temperature
B)  its acceleration
C)  its wavelength and energy
D)  the chemical composition of the object that emitted it

Question 7

Which of the following cannot be described by a field?

Accepted Answer

A)  gravitational forces
B)  electrical forces
C)  magnetic forces
D)  radiation pressure

Question 8

Grass is green because it absorbs green light,reflecting all other colors.

Accepted Answer

A) True 
 B)False

Question 9

Atomic nuclei consist of protons and electrons.

Accepted Answer

A) True 
 B)False

Question 10

The energy levels of an element and its ion are the same.

Accepted Answer

A) True 
 B)False

Question 11

How does the spectrum of a molecule differ from the spectrum of an atom?

Accepted Answer

A)  A molecule does not have spectral lines due to electrons changing energy levels.
B)  A molecule has additional spectral lines due to changes in its rotational and vibrational energies.
C)  Molecules only have spectral lines at ultraviolet wavelengths.
D)  Most atoms only have spectral lines at infrared wavelengths.
E)  An atom has a wider range of spectral lines than molecules.

Question 12

Energy and power are different words for the same thing.

Accepted Answer

A) True 
 B)False

Question 13

The following questions refer to the diagram below.The levels represent energy levels in a hydrogen atom.Each level is labeled with its energy (above the ground state of Level 1)in units of electron/volts (eV).The labeled transitions represent an electron moving between energy levels.
 
-Which transition,as shown,is not possible?

Accepted Answer

The answer of The following questions refer to the diagram...

Question 14

Suppose you have a chunk of water ice.Describe what happens to it,in terms of phases,as you raise the temperature to millions of degrees.

Accepted Answer

The ice melts into liquid,then...

Question 15

Suppose that Star X and Star Y both have redshifts,but Star X has a larger redshift than Star Y.What can you conclude?

Accepted Answer

A)  Star X is moving away from us faster than Star Y.
B)  Star Y is moving away from us faster than Star X.
C)  Star X is hotter than Star Y.
D)  Star X is moving away from us and Star Y is moving toward us.

Question 16

When an atom absorbs a photon containing energy,any of the following can happen except which?

Accepted Answer

A)  The atom becomes excited.
B)  The atom is ionized.
C)  An electron moves from an upper energy level to a lower one.
D)  An electron moves from a lower energy level to an upper one.

Question 17

Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons.What is its atomic number and atomic mass number?

Accepted Answer

A)  atomic number = 6;atomic mass number = 13
B)  atomic number = 6;atomic mass number = 7
C)  atomic number = 13;atomic mass number = 6
D)  atomic number = 7;atomic mass number = 13

Question 18

What does atomic number refers to?

Accepted Answer

the number...

Question 19

Which of the following statements about thermal radiation is always true?

Accepted Answer

A)  A hot object emits more X-rays than a cool object.
B)  A hot object emits more radio waves than a cool object.
C)  A hot object emits more total radiation than a cool object.
D)  A hot object emits more total radiation per unit surface area than a cool object.
E)  A hot object emits less total radiation than a cool object.

Question 20

What do we mean when we say that electron energy levels in atoms are quantized?

Accepted Answer

The electrons can ha...

Exam 5: Light and Matter: Reading Messages from the Cosmos

What do we mean when we say that electron energy levels in atoms are quantized?

Correct Answer
verified
The electrons can ha...
View Answer

Atomic nuclei consist of protons and electrons.

Correct Answer
verified

Energy and power are different words for the same thing.

Correct Answer
verified

Suppose you have a chunk of water ice.Describe what happens to it,in terms of phases,as you raise the temperature to millions of degrees.

Correct Answer
verified
The ice melts into liquid,then...
View Answer

We can learn a lot about the properties of a star by studying its spectrum.All of the following statements are true except one.Which one?

Correct Answer
verified

When an atom absorbs a photon containing energy,any of the following can happen except which?

Correct Answer
verified

Which of the following cannot be described by a field?

Correct Answer
verified

The greater the wavelength of light,the greater its energy.

Correct Answer
verified

Suppose that two stars are identical in every way-for example,same distance,same mass,same temperature,same chemical composition,and same speed relative to Earth-except that one star rotates faster than the other.Spectroscopically,how could you tell the stars apart?

Correct Answer
verified

How does the spectrum of a molecule differ from the spectrum of an atom?

Correct Answer
verified

The energy levels of an element and its ion are the same.

Correct Answer
verified

A gas heated to millions of degrees would emit

Correct Answer
verified

What does atomic number refers to?

Correct Answer
verified
the number...
View Answer

Grass is green because it absorbs green light,reflecting all other colors.

Correct Answer
verified

Which of the following statements about thermal radiation is always true?

Correct Answer
verified

The frequency of a wave is

Correct Answer
verified

Suppose you know the frequency of a photon and the speed of light.What else can you determine about the photon?

Correct Answer
verified

Suppose that Star X and Star Y both have redshifts,but Star X has a larger redshift than Star Y.What can you conclude?

Correct Answer
verified

Correct Answer
verified

Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons.What is its atomic number and atomic mass number?

Correct Answer
verified

Exam 5: Light and Matter: Reading Messages from the Cosmos

What do we mean when we say that electron energy levels in atoms are quantized?

Correct AnswerverifiedThe electrons can ha...View AnswerShow Answer

Atomic nuclei consist of protons and electrons.

Correct AnswerverifiedShow Answer

Energy and power are different words for the same thing.

Correct AnswerverifiedShow Answer

Suppose you have a chunk of water ice.Describe what happens to it,in terms of phases,as you raise the temperature to millions of degrees.

Correct AnswerverifiedThe ice melts into liquid,then...View AnswerShow Answer

We can learn a lot about the properties of a star by studying its spectrum.All of the following statements are true except one.Which one?

Correct AnswerverifiedShow Answer

When an atom absorbs a photon containing energy,any of the following can happen except which?

Correct AnswerverifiedShow Answer

Which of the following cannot be described by a field?

Correct AnswerverifiedShow Answer

The greater the wavelength of light,the greater its energy.

Correct AnswerverifiedShow Answer

Suppose that two stars are identical in every way-for example,same distance,same mass,same temperature,same chemical composition,and same speed relative to Earth-except that one star rotates faster than the other.Spectroscopically,how could you tell the stars apart?

Correct AnswerverifiedShow Answer

How does the spectrum of a molecule differ from the spectrum of an atom?

Correct AnswerverifiedShow Answer

The energy levels of an element and its ion are the same.

Correct AnswerverifiedShow Answer

A gas heated to millions of degrees would emit

Correct AnswerverifiedShow Answer

What does atomic number refers to?

Correct Answerverifiedthe number...View AnswerShow Answer

Grass is green because it absorbs green light,reflecting all other colors.

Correct AnswerverifiedShow Answer

Which of the following statements about thermal radiation is always true?

Correct AnswerverifiedShow Answer

The frequency of a wave is

Correct AnswerverifiedShow Answer

Suppose you know the frequency of a photon and the speed of light.What else can you determine about the photon?

Correct AnswerverifiedShow Answer

Suppose that Star X and Star Y both have redshifts,but Star X has a larger redshift than Star Y.What can you conclude?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons.What is its atomic number and atomic mass number?

Correct AnswerverifiedShow Answer

Correct Answer
verified
The electrons can ha...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The ice melts into liquid,then...
View Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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the number...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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