Question 1

Which of the following effects would stop novas occurring on a white dwarf for a period of tens of millions of years?

Accepted Answer

A)  the white dwarf's interior cooling to low temperatures 
B)  the white dwarf's companion evolving onto the horizontal branch 
C)  the white dwarf undergoing a thermonuclear runaway on its surface 
D)  the white dwarf becoming tidally locked to its companion 
A)  the white dwarf's interior cooling to low temperatures 
B)  the white dwarf's companion evolving onto the horizontal branch 
C)  the white dwarf undergoing a thermonuclear runaway on its surface 
D)  the white dwarf becoming tidally locked to its companion

Question 2

The figure below shows the trajectory of a star on the HR diagram as it moves along the red giant branch.How does its radius at point 3 compare to its radius at point 1?

Accepted Answer

A)  It is 100 times larger at point 3. 
B)  It is 10 times larger at point 3. 
C)  It is 2 times larger at point 3. 
D)  It is 10 times smaller at point 3. 
A)  It is 100 times larger at point 3. 
B)  It is 10 times larger at point 3. 
C)  It is 2 times larger at point 3. 
D)  It is 10 times smaller at point 3.

Question 3

Which of the following is closest in radius to a neutron star?

Accepted Answer

A)  Earth 
B)  the United States 
C)  a small city 
D)  a football stadium 
A)  Earth 
B)  the United States 
C)  a small city 
D)  a football stadium

Question 4

An isolated star's eventual fate is ultimately determined by its:

Accepted Answer

A)  environment. 
B)  composition. 
C)  mass. 
D)  distance. 
A)  environment. 
B)  composition. 
C)  mass. 
D)  distance.

Question 5

How will the Sun generate its energy when it eventually passes up the asymptotic giant branch?

Accepted Answer

It will fuse hydroge

Question 6

What carries the bulk of the energy from the gravitational collapse of a massive star's core during a supernova?

Accepted Answer

A)  neutrinos 
B)  radioactive nickel 
C)  gamma rays 
D)  optical light 
A)  neutrinos 
B)  radioactive nickel 
C)  gamma rays 
D)  optical light

Question 7

Why does the duration over which a massive star fuses elements decrease from hydrogen to iron?

Accepted Answer

A)  The core temperature increases. 
B)  The star produces less energy per fusion reaction. 
C)  The core density increases. 
D)  all of the above 
A)  The core temperature increases. 
B)  The star produces less energy per fusion reaction. 
C)  The core density increases. 
D)  all of the above

Question 8

A white dwarf has a temperature 10 times that of the Sun,but it has a radius 1,000 times smaller than the Sun.What is its luminosity?

Accepted Answer

A)  10 solar luminosities 
B)  0.1 solar luminosities 
C)  0.01 solar luminosities 
D)  10-4 solar luminosities 
A)  10 solar luminosities 
B)  0.1 solar luminosities 
C)  0.01 solar luminosities 
D)  10-4 solar luminosities

Question 9

The Sun will undergo fusion in its core during which of the following evolutionary phases?

Accepted Answer

A)  main sequence and horizontal branch 
B)  main sequence and red giant 
C)  main sequence only 
D)  main sequence, red giant, horizontal branch, and asymptotic giant branch 
A)  main sequence and horizontal branch 
B)  main sequence and red giant 
C)  main sequence only 
D)  main sequence, red giant, horizontal branch, and asymptotic giant branch

Question 10

Suppose that dust could not form in the outer parts of asymptotic giant branch stars.How would that affect the composition of the interstellar medium?

Accepted Answer

Winds from AGB stars would be

Which of the following effects would stop novas occurring on a white dwarf for a period of tens of millions of years?

The figure below shows the trajectory of a star on the HR diagram as it moves along the red giant branch.How does its radius at point 3 compare to its radius at point 1?

Which of the following is closest in radius to a neutron star?

An isolated star's eventual fate is ultimately determined by its:

How will the Sun generate its energy when it eventually passes up the asymptotic giant branch?

What carries the bulk of the energy from the gravitational collapse of a massive star's core during a supernova?

Why does the duration over which a massive star fuses elements decrease from hydrogen to iron?

A white dwarf has a temperature 10 times that of the Sun,but it has a radius 1,000 times smaller than the Sun.What is its luminosity?

The Sun will undergo fusion in its core during which of the following evolutionary phases?

Suppose that dust could not form in the outer parts of asymptotic giant branch stars.How would that affect the composition of the interstellar medium?

Getting Started: Science, astronomy, and Being Human

A Universe Made, a Universe Discovered

A Universe of Universal Laws

A Universe of Universal Laws

The Architecture and Birth of Planetary Systems

Home Base: Earth and Moon

Sibling Worlds: Mercury, Venus, and Mars

Gas, ice, and Stone: the Outer Planets

Life and the Search for Habitable Worlds

The Sun As a Star

Measuring the Stars: the Main Sequence and Its Meaning

Nursery of the Stars: the Interstellar Medium and Star Formation

Down the Rabbit Hole: Relativity and Black Holes

Our City of Stars: the Milky Way

A Universe of Galaxies

The Cosmic Web: the Large-Scale Structure of the Universe

Cosmology

Filters

Exam 13: To the Graveyard of Stars: the End Points of Stellar Evolution

Which of the following effects would stop novas occurring on a white dwarf for a period of tens of millions of years?

The figure below shows the trajectory of a star on the HR diagram as it moves along the red giant branch.How does its radius at point 3 compare to its radius at point 1?

Which of the following is closest in radius to a neutron star?

An isolated star's eventual fate is ultimately determined by its:

How will the Sun generate its energy when it eventually passes up the asymptotic giant branch?

What carries the bulk of the energy from the gravitational collapse of a massive star's core during a supernova?

Why does the duration over which a massive star fuses elements decrease from hydrogen to iron?

A white dwarf has a temperature 10 times that of the Sun,but it has a radius 1,000 times smaller than the Sun.What is its luminosity?

The Sun will undergo fusion in its core during which of the following evolutionary phases?

Suppose that dust could not form in the outer parts of asymptotic giant branch stars.How would that affect the composition of the interstellar medium?

Getting Started: Science, astronomy, and Being Human

A Universe Made, a Universe Discovered

A Universe of Universal Laws

A Universe of Universal Laws

The Architecture and Birth of Planetary Systems

Home Base: Earth and Moon

Sibling Worlds: Mercury, Venus, and Mars

Gas, ice, and Stone: the Outer Planets

Life and the Search for Habitable Worlds

The Sun As a Star

Measuring the Stars: the Main Sequence and Its Meaning

Nursery of the Stars: the Interstellar Medium and Star Formation

Down the Rabbit Hole: Relativity and Black Holes

Our City of Stars: the Milky Way

A Universe of Galaxies

The Cosmic Web: the Large-Scale Structure of the Universe

Cosmology

Filters