Name: 
 

Chapter 6 Quiz



True/False
Indicate whether the sentence or statement is true or false. (1-Point Each)
 

 1. 

An absorption spectrum is also called a bright line spectrum.
 

 2. 

Isotopes of the same element have the same number of protons.
 

 3. 

Hydrogen lines are weak in the spectra of hot stars because many of the hydrogen atoms are ionized.
 

 4. 

Blue stars are hotter than red stars.
 

 5. 

The Lyman series lines of hydrogen all lie in the infrared.
 

 6. 

The Doppler effect is sensitive only to motion along the line of sight.
 

 7. 

An atom that has lost an electron is called an ion.
 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question. (3-Points Each)
 

 8. 

The diagram below illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an continuous spectrum?

mc008-1.jpg
a.
1
b.
2
c.
3
d.
2 and 3
e.
none of them
 

 9. 

The neutral hydrogen atom consists of
a.
one proton and one neutron.
b.
one proton.
c.
one proton, one neutron, and one electron.
d.
one proton and one electron.
e.
an isotope and an ion.
 

 10. 

Which of the following can be determined by using the Doppler effect?
a.
The speed at which a star is moving away from an observer.
b.
The transverse velocity of a star.
c.
The speed at which a car is traveling toward an observer.
d.
Both a and c
e.
We need more information to answer this question
 

 11. 

The diagram below illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an emission spectrum?

mc011-1.jpg
a.
1
b.
2
c.
3
d.
2 and 3
e.
none of them
 

 12. 

You are standing near a railroad track and a train is moving toward you at 60 mph and blowing its horn. What will you notice as the train moves past you?
a.
As the train approaches, the horn will sound lower in pitch than when the train is moving away.
b.
As the train approaches, the horn will sound higher in pitch than when the train is moving away.
c.
There will be no change in the pitch of the horn as it moves by.
d.
The horn will get louder as the train moves away from you.
e.
The horn will get quieter as the train moves toward you.
 

 13. 

In the diagram below, which of the transitions would absorb a photon with the greatest energy.

mc013-1.jpg
a.
Transition 1
b.
Transition 2
c.
Transition 3
d.
Transition 4
e.
Transition 5
 

 14. 

The diagram below illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an absorption spectrum?

mc014-1.jpg**
a.
1
b.
2
c.
3
d.
2 and 3
e.
none of them
 

 15. 

An atom can be excited
a.
if it emits a photon.
b.
if it collides with another atom or electron.
c.
if it absorbs a photon.
d.
a and b above
e.
b and c above
 

Fill in the Blank
Fill in the blank for the following questions.  (5-Points or more each)
 

 16. 

Fill in the following table:
Spectral Class
Temperature (K)
Balmer Lines
Other Elements

   

   

   

   

   

   

   
 

Short Answer
Provide a short answer to the following questions.  (5-Points or more Each)
 

 17. 

Why do molecular bands only occur in the spectra of the coolest stars?
 

 18. 

If a star's spectrum does not contain spectral lines characteristic of a certain element, can we conclude that the star do not contain that element? Why or Why not?  (Answer both questions)
 



 
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