Question 1

A   star in a binary system could create the following chemical element and eject it into the interstellar medium:

Accepted Answer

A)  carbon 
B)  helium 
C)  iron 
D)  All of the above 
A)  carbon 
B)  helium 
C)  iron 
D)  All of the above

Question 2

What is the radius of a red giant star that has a temperature of   and a temperature of 4,000 K? (Note that the temperature of the Sun is 5,800 K. )

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 3

A white dwarf with a temperature of 30,000 K would shine brightest at what wavelength?

Accepted Answer

A)  4 nm,X-rays 
B)  100 nm,ultraviolet 
C)  400 nm,blue visible 
D)  1 $\mu$m,infrared 
A)  4 nm,X-rays 
B)  100 nm,ultraviolet 
C)  400 nm,blue visible 
D)  1 $\mu$m,infrared

Question 4

A star like the Sun will eventually become an electron degenerate white dwarf star.

Accepted Answer

A) True 
 B)False

Question 5

The Sun will become a red giant star in about 2 billion years.

Accepted Answer

A) True 
 B)False

Question 6

What factor is most important in determining a star's position on the main sequence and subsequent evolution?

Accepted Answer

A)  Temperature 
B)  Pressure 
C)  Mass 
D)  Radius 
A)  Temperature 
B)  Pressure 
C)  Mass 
D)  Radius

Question 7

Just as a low-mass main-sequence star runs out of fuel in its core,it grows more luminous.How is this possible?

Accepted Answer

A)  It explodes. 
B)  It begins to fuse helium in the core. 
C)  Its core expands as it runs out of fuel. 
D)  Its core shrinks,bringing more hydrogen fuel into the burning region. 
A)  It explodes. 
B)  It begins to fuse helium in the core. 
C)  Its core expands as it runs out of fuel. 
D)  Its core shrinks,bringing more hydrogen fuel into the burning region.

Question 8

The more massive a star,the more hydrogen it has to burn,and the longer its main-sequence lifetime will be.

Accepted Answer

A) True 
 B)False

Question 9

Explain the two different forms of pressure that support the core of a low-mass main-sequence star and the core of a low-mass red giant star?

Accepted Answer

The core of a low-mass main-sequence sta

Question 10

What would you need to measure about a planetary nebula to determine how long ago its parent star died?

Accepted Answer

A)  The mass of the white dwarf 
B)  The mass and radius of the white dwarf 
C)  The nebula's temperature and radius 
D)  The nebula's radius and expansion velocity 
A)  The mass of the white dwarf 
B)  The mass and radius of the white dwarf 
C)  The nebula's temperature and radius 
D)  The nebula's radius and expansion velocity

Question 11

The evolutionary cutoff between low- and high-mass stars occurs at approximately

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 12

Consider a   star's journey up the red giant branch.Its luminosity will change from   to nearly   .How will its temperature and radius change as the star ascends? (Recall that   . )

Accepted Answer

The red giant star's temperature will es

Question 13

Consider a red giant star with a luminosity of   and a radius of   .Using the luminosity-temperature-radius relationship   ,calculate how hot this star's surface temperature will be compared to the Sun,whose temperature is 5,800 K.

Accepted Answer

The answer of Consider a red giant star with a...

Question 14

In what two ways does temperature affect the rate of nuclear reactions?

Accepted Answer

Higher temperature means atomic nuclei a

Question 15

A Type I supernova occurs when a white dwarf exceeds a mass of __________.

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 16

What is the escape velocity from the surface of a   star that has a radius of   ?

Accepted Answer

A)  60 km/s 
B)  120 km/s 
C)  240 km/s 
D)  620 km/s 
A)  60 km/s 
B)  120 km/s 
C)  240 km/s 
D)  620 km/s

Question 17

The Ring Nebula is a planetary nebula that currently has a radius of 0.4 pc and an expansion velocity of 250 km/s.Approximately how long ago did its parent star die and eject its outer layers?

Accepted Answer

A)  1,600 years ago 
B)  3,200 years ago 
C)  5,400 years ago 
D)  28,000 years ago 
A)  1,600 years ago 
B)  3,200 years ago 
C)  5,400 years ago 
D)  28,000 years ago

Question 18

When a star burns hydrogen in a shell,it will never produce as much energy (per unit time)as when it burns hydrogen in the core because the core has a higher temperature.

Accepted Answer

A) True 
 B)False

Question 19

Stars with masses similar to the Sun will loose about 30 percent of their mass before they become white dwarfs.

Accepted Answer

A) True 
 B)False

Question 20

As a main-sequence star burns its core supply of hydrogen,what happens?

Accepted Answer

A)  Helium begins to fuse throughout the core. 
B)  Helium fuses in a shell surrounding the core. 
C)  Helium fusion takes place only at the very center of the core,where temperature and pressure are highest. 
D)  Helium builds up as ash in the core. 
A)  Helium begins to fuse throughout the core. 
B)  Helium fuses in a shell surrounding the core. 
C)  Helium fusion takes place only at the very center of the core,where temperature and pressure are highest. 
D)  Helium builds up as ash in the core.

Exam 16: Stars in the Slow Lanelow-Mass Stellar Evolution

A star in a binary system could create the following chemical element and eject it into the interstellar medium:

What is the radius of a red giant star that has a temperature of and a temperature of 4,000 K? (Note that the temperature of the Sun is 5,800 K. )

A white dwarf with a temperature of 30,000 K would shine brightest at what wavelength?

A star like the Sun will eventually become an electron degenerate white dwarf star.

The Sun will become a red giant star in about 2 billion years.

What factor is most important in determining a star's position on the main sequence and subsequent evolution?

Just as a low-mass main-sequence star runs out of fuel in its core,it grows more luminous.How is this possible?

The more massive a star,the more hydrogen it has to burn,and the longer its main-sequence lifetime will be.

Explain the two different forms of pressure that support the core of a low-mass main-sequence star and the core of a low-mass red giant star?

What would you need to measure about a planetary nebula to determine how long ago its parent star died?

The evolutionary cutoff between low- and high-mass stars occurs at approximately

Consider a star's journey up the red giant branch.Its luminosity will change from to nearly .How will its temperature and radius change as the star ascends? (Recall that . )

Consider a red giant star with a luminosity of and a radius of .Using the luminosity-temperature-radius relationship ,calculate how hot this star's surface temperature will be compared to the Sun,whose temperature is 5,800 K.

In what two ways does temperature affect the rate of nuclear reactions?

A Type I supernova occurs when a white dwarf exceeds a mass of __________.

What is the escape velocity from the surface of a star that has a radius of ?

The Ring Nebula is a planetary nebula that currently has a radius of 0.4 pc and an expansion velocity of 250 km/s.Approximately how long ago did its parent star die and eject its outer layers?

When a star burns hydrogen in a shell,it will never produce as much energy (per unit time)as when it burns hydrogen in the core because the core has a higher temperature.

Stars with masses similar to the Sun will loose about 30 percent of their mass before they become white dwarfs.

As a main-sequence star burns its core supply of hydrogen,what happens?

Why Learn Astronomy

Patterns in the Skymotions of Earth

Gravity and Orbitsa Celestial Ballet

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquidthe Giant Planets

Gravity Is More Than Keplers Laws

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

A Run-Of-The-Mill G-Type Starour Sun

Star Formation and the Interstellar Medium

Live Fast,die Younghigh-Mass Stellar Evolution

Our Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

The Origin of Structure

Life

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