Question 1

The outward pressure in the core of a red giant balances the inward pull of gravity when

Accepted Answer

A)   the electrons and protons have combined to form neutrons.
B)   hydrogen begins fusing into helium.
C)   iron forms in the inner core.
D)   carbon fuses into heavier elements.
E)   the electron orbits are compressed so much they are all in contact.

Question 2

If it gains sufficient mass from a binary companion, a white dwarf can become a

Accepted Answer

A)   black dwarf.
B)   planetary nebula.
C)   Type II supernova.
D)   brown dwarf.
E)   Type I supernova.

Question 3

Contrast the deaths of low- versus high- mass stars.

Accepted Answer

Low- mass stars swell up as red giants, ...

Question 4

Paradoxically, while the core of the red giant is contracting and heating up, its radiation pressure causes its photosphere to swell up and cool off.

Accepted Answer

A) True 
 B)False

Question 5

Most of the energy released during a supernova is emitted as neutrinos.

Accepted Answer

A) True 
 B)False

Question 6

What is the importance of 1.4 solar masses in stellar evolution?

Accepted Answer

1.4 solar masses is the Chandrasekhar li...

Question 7

What temperature is needed to fuse helium into carbon?

Accepted Answer

A)   5,800 K
B)   100,000 K
C)   15 million K
D)   100 million K
E)   one billion K

Question 8

Solar mass stars eventually become hot enough for carbon nuclei to fuse together.

Accepted Answer

A) True 
 B)False

Question 9

A recurrent nova could eventually build up to a

Accepted Answer

A)   core composed of iron.
B)   Type II supernova.
C)   helium flash.
D)   planetary nebula.
E)   Type I supernova.

Question 10

Compared to a cluster containing type O and B stars, a cluster with only type F and cooler stars will be

Accepted Answer

A)   younger.
B)   further away.
C)   older.
D)   more obscured by dust.
E)   less obscured by dust.

Question 11

The number of Type I and Type II supernovae observed are approximately equal.

Accepted Answer

A) True 
 B)False

Question 12

Like emission nebulae, planetary nebulae glow because hot stars are causing the gases to ionize when exposed to strong ultraviolet radiation.

Accepted Answer

A) True 
 B)False

Question 13

A small, dense star the size of Earth that shines by only stored heat is a

Accepted Answer

A)   blue straggler.
B)   white dwarf.
C)   blue dwarf.
D)   black dwarf.
E)   brown dwarf.

Question 14

Why is our Sun not forming carbon and heavier elements yet?

Accepted Answer

It still has plenty of hydrogen in its c...

Question 15

Helium fusion requires a higher temperature than hydrogen fusion.

Accepted Answer

A) True 
 B)False

Question 16

On the H- R diagram, a star's position on the main sequence depends on the star's
.

Accepted Answer

The answer of On the H- R diagram, a star's...

Question 17

Which stars in globular clusters are believed to be examples of mergers?

Accepted Answer

A)   blue stragglers
B)   brown dwarfs
C)   planetary nebulae cores
D)   blue supergiants
E)   eclipsing binaries

Question 18

Our Sun will fade in luminosity as its supply of hydrogen drops in a billion years.

Accepted Answer

A) True 
 B)False

Question 19

Will the Sun become a brown dwarf? Explain.

Accepted Answer

No, our Sun is massive enough ...

Question 20

As a 6 solar- mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity

Accepted Answer

A)   first decreases, then increases.
B)   first increases, then decreases.
C)   remains roughly constant.
D)   decreases.
E)   increases.

Exam 13: Stellar Evolution: the Lives and Deaths of Stars

If it gains sufficient mass from a binary companion, a white dwarf can become a

Correct AnswerverifiedShow Answer

Like emission nebulae, planetary nebulae glow because hot stars are causing the gases to ionize when exposed to strong ultraviolet radiation.

Correct AnswerverifiedShow Answer

Why is our Sun not forming carbon and heavier elements yet?

Correct AnswerverifiedIt still has plenty of hydrogen in its c...View AnswerShow Answer

What temperature is needed to fuse helium into carbon?

Correct AnswerverifiedShow Answer

As a 6 solar- mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity

Correct AnswerverifiedShow Answer

On the H- R diagram, a star's position on the main sequence depends on the star's .

Correct AnswerverifiedShow Answer

Which stars in globular clusters are believed to be examples of mergers?

Correct AnswerverifiedShow Answer

Helium fusion requires a higher temperature than hydrogen fusion.

Correct AnswerverifiedShow Answer

Paradoxically, while the core of the red giant is contracting and heating up, its radiation pressure causes its photosphere to swell up and cool off.

Correct AnswerverifiedShow Answer

The outward pressure in the core of a red giant balances the inward pull of gravity when

Correct AnswerverifiedShow Answer

Will the Sun become a brown dwarf? Explain.

Correct AnswerverifiedNo, our Sun is massive enough ...View AnswerShow Answer

The number of Type I and Type II supernovae observed are approximately equal.

Correct AnswerverifiedShow Answer

Our Sun will fade in luminosity as its supply of hydrogen drops in a billion years.

Correct AnswerverifiedShow Answer

Most of the energy released during a supernova is emitted as neutrinos.

Correct AnswerverifiedShow Answer

A recurrent nova could eventually build up to a

Correct AnswerverifiedShow Answer

What is the importance of 1.4 solar masses in stellar evolution?

Correct Answerverified1.4 solar masses is the Chandrasekhar li...View AnswerShow Answer

Contrast the deaths of low- versus high- mass stars.

Correct AnswerverifiedLow- mass stars swell up as red giants, ...View AnswerShow Answer

Solar mass stars eventually become hot enough for carbon nuclei to fuse together.

Correct AnswerverifiedShow Answer

Compared to a cluster containing type O and B stars, a cluster with only type F and cooler stars will be

Correct AnswerverifiedShow Answer

A small, dense star the size of Earth that shines by only stored heat is a

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
It still has plenty of hydrogen in its c...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
No, our Sun is massive enough ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
1.4 solar masses is the Chandrasekhar li...
View Answer

Correct Answer
verified
Low- mass stars swell up as red giants, ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified