Question 1

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 2

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 items 
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 items D

Question 3

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 R 
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 R B

Question 4

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 core 
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 core

Question 5

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 Pulsar 
A)  degenerate star 
B)  RR Lyrae variable star 
C)  eclipsing binary star 
D)  Cepheid variable star 
E)  Type I Pulsar

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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 8

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 9

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

Accepted Answer

hydrogen;

Question 10

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 11

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

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

1 Hydrostatic Equilibrium:  The weight o

Question 13

What is degenerate matter?

Accepted Answer

Degenerate matter is a gas tha

Question 14

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 15

List the four laws of stellar structure.

Accepted Answer

1 hydrostatic equili

Question 16

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 17

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

Accepted Answer

blue,bluei

Question 18

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 19

Why do Cepheids pulsate?

Accepted Answer

Studies using stellar models show that v

Question 20

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 present 
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 present

Exam 12: Stellar Evolution

Define nuclear fusion.

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

Cepheid variable stars are classified as either ____.

Stars support their weight by generating ____.

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) ____.

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

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

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

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

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

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

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

What is degenerate matter?

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

List the four laws of stellar structure.

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

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

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.

Why do Cepheids pulsate?

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 ____.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology

Filters

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