Question 1

What is degenerate matter?

Accepted Answer

Degenerate matter is a gas tha...

Question 2

List the four laws of stellar structure.

Accepted Answer

1 hydrostatic equili...

Question 3

Why are massive stars more luminous than low mass stars? That is, why is there a mass-luminosity relation?

Accepted Answer

The mass-luminosity relation exists beca...

Question 4

When a gas is so dense that most of its electrons are not free to change their energies, it is called _______________.

Accepted Answer

The answer of When a gas is so dense that...

Question 5

Explain how one of the four laws of stellar structure works.

Accepted Answer

1 Hydrostatic Equilibrium:  The weight o...

Question 6

Where are the Cepheid and RR Lyrae variable stars located on the H-R Diagram?

Accepted Answer

A)   just above and to the right of B type stars
B)   just above and to the right of O type stars
C)   in the variable strip
D)   in the instability strip
E)   outside the H-R Diagram as missing itemsF) All of the above
G) None of the above D

Question 7

Giant and supergiant stars are rare because they do not form as often as main sequence stars.

Accepted Answer

A) True 
 B)False

Question 8

There is a mass-luminosity relationship because stars support their weight by generating energy, and more massive stars have more weight to support.

Accepted Answer

A) True 
 B)False

Question 9

A open star cluster will have a(n) _____________ turn-off point than an older star cluster.

Accepted Answer

blue,bluei...

Question 10

Cepheid variable stars are classified as either ____.

Accepted Answer

A)   Type A or Type B
B)   Type I or Type II
C)   Class A or Class B
D)   Class I or Class II
E)   Type C or Type RF) A) and C)
G) D) and E) B

Question 11

Helium fusion is sometimes referred to as the _______________  because three helium nuclei are needed to make a carbon nucleus, and because the helium nucleus is called an alpha particle.

Accepted Answer

triple alp...

Question 12

Why is there a lower end in the main sequence of the H-R diagram?

Accepted Answer

The lower end in the main sequence show ...

Question 13

Stars support their weight by generating ____.

Accepted Answer

A)   magnetic fields throughout the star
B)   magnetic fields throughout the star.
C)   energy in their centers
D)   magnetic-plasmas at their core
E)   energy-plasmas at their coreF) C) and D)
G) All of the above

Question 14

Stellar models can easily be accomplished by using a simple hand calculator.

Accepted Answer

A) True 
 B)False

Question 15

Define nuclear fusion.

Accepted Answer

Nuclear fusion is the combining of lighter elements to forum heavier elements, with the release of energy.   Four hydrogen atoms fuse into one helium atom.   All main sequence stars are in the process of fusing hydrogen into helium.

Question 16

The two elements a one-solar-mass star uses over the course of its entire evolution are   _______________ and _____________.

Accepted Answer

hydrogen; ...

Question 17

If you observe a variable star with a period of 50 days as a yellow, supergiant star, then you most likely have seen a(n)  ____.

Accepted Answer

A)   degenerate star
B)   RR Lyrae variable star
C)   eclipsing binary star
D)   Cepheid variable star
E)   Type I PulsarF) None of the above
G) D) and E)

Question 18

Degenerate matter has two peculiar properties that can affect a star.  One is that the degenerate gas resists compression, and the other is that the degenerate gas ____.

Accepted Answer

A)   is not density dependent
B)   does depend on temperature
C)   does not depend on temperature
D)   is not pressure dependent.
E)   does depend on the type of nuclei presentF) C) and D)
G) A) and E)

Question 19

As a star like the Sun exhausts hydrogen in its core, the outer layers of the star become hotter and more luminous.

Accepted Answer

A) True 
 B)False

Question 20

Why do Cepheids pulsate?

Accepted Answer

Studies using stellar models show that v...

Exam 12: Stellar Evolution

What is degenerate matter?

Correct AnswerverifiedDegenerate matter is a gas tha...View AnswerShow Answer

List the four laws of stellar structure.

Correct Answerverified1 hydrostatic equili...View AnswerShow Answer

Why are massive stars more luminous than low mass stars? That is, why is there a mass-luminosity relation?

Correct AnswerverifiedThe mass-luminosity relation exists beca...View AnswerShow Answer

When a gas is so dense that most of its electrons are not free to change their energies, it is called _______________.

Correct AnswerverifiedShow Answer

Explain how one of the four laws of stellar structure works.

Correct Answerverified1 Hydrostatic Equilibrium: The weight o...View AnswerShow Answer

Where are the Cepheid and RR Lyrae variable stars located on the H-R Diagram?

Correct AnswerverifiedD

Giant and supergiant stars are rare because they do not form as often as main sequence stars.

Correct AnswerverifiedShow Answer

There is a mass-luminosity relationship because stars support their weight by generating energy, and more massive stars have more weight to support.

Correct AnswerverifiedShow Answer

A open star cluster will have a(n) _____________ turn-off point than an older star cluster.

Correct Answerverifiedblue,bluei...View AnswerShow Answer

Cepheid variable stars are classified as either ____.

Correct AnswerverifiedB

Helium fusion is sometimes referred to as the _______________ because three helium nuclei are needed to make a carbon nucleus, and because the helium nucleus is called an alpha particle.

Correct Answerverifiedtriple alp...View AnswerShow Answer

Why is there a lower end in the main sequence of the H-R diagram?

Correct AnswerverifiedThe lower end in the main sequence show ...View AnswerShow Answer

Stars support their weight by generating ____.

Correct AnswerverifiedShow Answer

Stellar models can easily be accomplished by using a simple hand calculator.

Correct AnswerverifiedShow Answer

Define nuclear fusion.

Correct AnswerverifiedNuclear fusion is the combining of lighter elements to forum heavier elements, with the release of energy. Four hydrogen atoms fuse into one helium atom. All main sequence stars are in the process of fusing hydrogen into helium.

The two elements a one-solar-mass star uses over the course of its entire evolution are _______________ and _____________.

Correct Answerverifiedhydrogen; ...View AnswerShow Answer

If you observe a variable star with a period of 50 days as a yellow, supergiant star, then you most likely have seen a(n) ____.

Correct AnswerverifiedShow Answer

Degenerate matter has two peculiar properties that can affect a star. One is that the degenerate gas resists compression, and the other is that the degenerate gas ____.

Correct AnswerverifiedShow Answer

As a star like the Sun exhausts hydrogen in its core, the outer layers of the star become hotter and more luminous.

Correct AnswerverifiedShow Answer

Why do Cepheids pulsate?

Correct AnswerverifiedStudies using stellar models show that v...View AnswerShow Answer

Correct Answer
verified
Degenerate matter is a gas tha...
View Answer

Correct Answer
verified
1 hydrostatic equili...
View Answer

Correct Answer
verified
The mass-luminosity relation exists beca...
View Answer

Correct Answer
verified

Correct Answer
verified
1 Hydrostatic Equilibrium: The weight o...
View Answer

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
blue,bluei...
View Answer

Correct Answer
verified
B

Correct Answer
verified
triple alp...
View Answer

Correct Answer
verified
The lower end in the main sequence show ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Nuclear fusion is the combining of lighter elements to forum heavier elements, with the release of energy. Four hydrogen atoms fuse into one helium atom. All main sequence stars are in the process of fusing hydrogen into helium.

The two elements a one-solar-mass star uses over the course of its entire evolution are ___ and _.

Correct Answer
verified
hydrogen; ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Studies using stellar models show that v...
View Answer