Question 1

If you measure the average brightness and pulsation period of a Cepheid variable star,you can also determine its

Accepted Answer

A)  age. 
B)  rotation period. 
C)  distance. 
D)  mass. 
A)  age. 
B)  rotation period. 
C)  distance. 
D)  mass.

Question 2

The collapse of the core of a high-mass star at the end of its life lasts approximately

Accepted Answer

A)  one second. 
B)  one hour. 
C)  one week. 
D)  one year. 
A)  one second. 
B)  one hour. 
C)  one week. 
D)  one year.

Question 3

All evolutionary differences between high- and low-mass stars can be attributed to differences in the amount of gravity each star possesses.

Accepted Answer

A) True 
 B)False

Question 4

Which has a smaller radius,a   neutron star or a   neutron star? What supports each of these stars from collapsing to form a black hole?

Accepted Answer

The pressure from degenerate neutrons su

Question 5

What is the minimum mass main-sequence star that becomes a Type II supernova?

Accepted Answer

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

Question 6

Pulsating variable stars are more commonly known as pulsars.

Accepted Answer

A) True 
 B)False

Question 7

Hydrogen burns through the CNO cycle only in high-mass main-sequence stars because of the greater __________ in their cores.

Accepted Answer

A)  concentration of heavy elements like carbon 
B)  densities 
C)  abundance of hydrogen 
D)  temperatures 
A)  concentration of heavy elements like carbon 
B)  densities 
C)  abundance of hydrogen 
D)  temperatures

Question 8

Black holes have an infinitely small radius,but a finite event horizon.

Accepted Answer

A) True 
 B)False

Question 9

We can identify only a small fraction of all the pulsars that exist in our galaxy because

Accepted Answer

A)  gas and dust efficiently block radio photons. 
B)  few swing their beam of synchrotron emission in our direction. 
C)  most have evolved to become black holes,which emit no light. 
D)  massive stars are very rare. 
A)  gas and dust efficiently block radio photons. 
B)  few swing their beam of synchrotron emission in our direction. 
C)  most have evolved to become black holes,which emit no light. 
D)  massive stars are very rare.

Question 10

Explain why Einstein's theory of general relativity predicts the existence of gravitational lensing.

Accepted Answer

Einstein's theory of general relativity

Question 11

Gravity is nothing more than a curvature in the fabric of spacetime.

Accepted Answer

A) True 
 B)False

Question 12

If a   main-sequence star loses mass at a rate of   then how much mass will it lose in its 3-million-year lifetime?

Accepted Answer

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

Question 13

__________ is the result of mass distorting the fabric of spacetime.

Accepted Answer

A)  Energy 
B)  Radiation 
C)  Fusion 
D)  Gravity 
A)  Energy 
B)  Radiation 
C)  Fusion 
D)  Gravity

Question 14

The production of large numbers of neutrons in nuclear reactions at the core of a massive star helps rob the core of energy and speeds its eventual collapse.

Accepted Answer

A) True 
 B)False

Question 15

Although a Type II supernova shines with a luminosity of   ,most of the energy in the explosion is emitted in another way.What is it,and how much more energy does it carry compared to the light?

Accepted Answer

The majority of the energy released in a

Question 16

If an   star loses mass at an average rate of   in a stellar wind,how many years would it take for its mass be reduced to   ? Would this amount of mass loss be possible in the star's lifetime?

Accepted Answer

If R is the mass loss rate and M is the

Question 17

What is the difference between the singularity and the event horizon of a black hole?

Accepted Answer

The singularity is the very center of th

Question 18

An indestructible robot would feel __________ as it crossed the event horizon of a black hole.

Accepted Answer

A)  incredibly strong tidal forces 
B)  intense heating 
C)  intense gravitational stretching 
D)  nothing 
A)  incredibly strong tidal forces 
B)  intense heating 
C)  intense gravitational stretching 
D)  nothing

Question 19

Black holes emit no light whatsoever.

Accepted Answer

A) True 
 B)False

Question 20

When the core of a massive star collapses,a neutron star forms because

Accepted Answer

A)  all the charged particles are ejected in the resulting explosion. 
B)  protons and electrons combine to minimize electromagnetic forces. 
C)  iron nuclei disintegrate into neutrons. 
D)  neutrinos escaping from the core carry away most of the electromagnetic charge. 
A)  all the charged particles are ejected in the resulting explosion. 
B)  protons and electrons combine to minimize electromagnetic forces. 
C)  iron nuclei disintegrate into neutrons. 
D)  neutrinos escaping from the core carry away most of the electromagnetic charge.

Exam 17: Live Fast,die Younghigh-Mass Stellar Evolution

If you measure the average brightness and pulsation period of a Cepheid variable star,you can also determine its

The collapse of the core of a high-mass star at the end of its life lasts approximately

All evolutionary differences between high- and low-mass stars can be attributed to differences in the amount of gravity each star possesses.

Which has a smaller radius,a neutron star or a neutron star? What supports each of these stars from collapsing to form a black hole?

What is the minimum mass main-sequence star that becomes a Type II supernova?

Pulsating variable stars are more commonly known as pulsars.

Hydrogen burns through the CNO cycle only in high-mass main-sequence stars because of the greater __________ in their cores.

Black holes have an infinitely small radius,but a finite event horizon.

We can identify only a small fraction of all the pulsars that exist in our galaxy because

Explain why Einstein's theory of general relativity predicts the existence of gravitational lensing.

Gravity is nothing more than a curvature in the fabric of spacetime.

If a main-sequence star loses mass at a rate of then how much mass will it lose in its 3-million-year lifetime?

__________ is the result of mass distorting the fabric of spacetime.

The production of large numbers of neutrons in nuclear reactions at the core of a massive star helps rob the core of energy and speeds its eventual collapse.

Although a Type II supernova shines with a luminosity of ,most of the energy in the explosion is emitted in another way.What is it,and how much more energy does it carry compared to the light?

If an star loses mass at an average rate of in a stellar wind,how many years would it take for its mass be reduced to ? Would this amount of mass loss be possible in the star's lifetime?

What is the difference between the singularity and the event horizon of a black hole?

An indestructible robot would feel __________ as it crossed the event horizon of a black hole.

Black holes emit no light whatsoever.

When the core of a massive star collapses,a neutron star forms because

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

Stars in the Slow Lanelow-Mass Stellar Evolution

Our Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

The Origin of Structure

Life

Filters