Question 1

The escape velocity inside a black hole is

Accepted Answer

A)   zero.
B)   infinity.
C)   unknown.
D)   half the speed of light.
E)   greater than the speed of light.F) A) and C)
G) B) and E)

Question 2

The mass of a black hole can be determined by _____________.

Accepted Answer

A)   measuring its volume and density
B)   the electromagnetic radiation it emits
C)   how rapidly it is spinning
D)   applying the modified version of Kepler's Third law, if the black hole is in a binary systemE) A) and B)
F) B) and C)

Question 3

A gravitational wave can carry energy away from two very dense objects if they are orbiting each other or collide.

Accepted Answer

A) True 
 B)False

Question 4

The strong gravitational field of a white dwarf slows down the speed of escaping light, and results in the gravitational redshift.

Accepted Answer

A) True 
 B)False

Question 5

_____ are hot compact remnant stars whose mass is typically between one and several times that of the Sun, but their size is only 10 km or less.

Accepted Answer

A)   White dwarfs
B)   Neutron stars
C)   Pulsars
D)   Black dwarfsE) B) and C)
F) All of the above

Question 6

White dwarfs have a surface composed of a thin layer of ____________.

Accepted Answer

A)   hydrogen and oxygen
B)   hydrogen and helium
C)   carbon and oxygen
D)   carbon and heliumE) C) and D)
F) B) and D)

Question 7

The law of conservation of angular momentum states that when an object of a fixed mass changes its radius R, its rotation velocity V will change so that

Accepted Answer

A)   V/R = constant.
B)   VR = constant.
C)   R/V = constant.
D)   V2R = constant.
E)   R2V = constant.F) B) and D)
G) A) and B)

Question 8

Why do white dwarfs have high temperatures?

Accepted Answer

A)   heat left over from their formation
B)   chemical reactions on their surfaces
C)   nuclear fusion in their cores
D)   frictional heating from motions inside the white dwarfsE) A) and B)
F) A) and C)

Question 9

Millisecond pulsars rotate about ______ times per second.

Accepted Answer

A)   10
B)   100
C)   1,000
D)   1 millionE) None of the above
F) All of the above

Question 10

Type Ia supernovas involve a __________.

Accepted Answer

A)   white dwarf
B)   neutron star
C)   black hole
D)   planetary nebulaE) A) and B)
F) None of the above

Question 11

Pulsars are rotating white dwarfs.

Accepted Answer

A) True 
 B)False

Question 12

An isolated black hole will

Accepted Answer

A)   eventually suck in all of the universe.
B)   implode due to its own gravity.
C)   not change in any way.
D)   slowly evaporate away through the emission of Hawking radiation.E) B) and C)
F) None of the above

Question 13

Which of the following elements is NOT produced by neutron star mergers?

Accepted Answer

A)   Silver
B)   Gold
C)   Uranium
D)   Copper
E)   LeadF) A) and E)
G) C) and E)

Question 14

A Type Ia supernova results in the formation of a neutron star.

Accepted Answer

A) True 
 B)False

Question 15

In comparison to main sequence stars, which of the neutron star properties listed is not considered extreme?

Accepted Answer

A)   magnetic field
B)   spin rate
C)   density
D)   massE) All of the above
F) A) and B)

Question 16

White dwarfs have magnetic fields as much as 100 million times larger than Earth's magnetic field.

Accepted Answer

A) True 
 B)False

Question 17

This recurring event happens in the case of a binary system in which one of the companions is a neutron star.

Accepted Answer

A)   novae
B)   Type I supernovae
C)   Type II supernovae
D)   X-ray bursts
E)   None of these choices is correct.F) C) and E)
G) B) and D)

Question 18

This event recurs and happens when one of the companions in the binary system is a white dwarf.

Accepted Answer

A)   Nova
B)   Type I supernova
C)   Type II supernova
D)   Pulsar
E)   None of these choices is correct.F) A) and D)
G) A) and E)

Question 19

Which of the following elements is NOT produced in a Type Ia supernova?

Accepted Answer

A)   Silicon
B)   Nickel
C)   Cobalt
D)   Iron
E)   NeonF) A) and B)
G) B) and E)

Question 20

If left in isolation a white dwarf will eventually

Accepted Answer

A)   cool off and become a black dwarf.
B)   explode as a type la supernova.
C)   form a brown dwarf.
D)   become the seed for a new star.E) All of the above
F) None of the above

Exam 15: Stellar Remnants: White Dwarfs, Neutron Stars, and Black Holes

If left in isolation a white dwarf will eventually

Correct AnswerverifiedShow Answer

This event recurs and happens when one of the companions in the binary system is a white dwarf.

Correct AnswerverifiedShow Answer

In comparison to main sequence stars, which of the neutron star properties listed is not considered extreme?

Correct AnswerverifiedShow Answer

A Type Ia supernova results in the formation of a neutron star.

Correct AnswerverifiedShow Answer

Which of the following elements is NOT produced by neutron star mergers?

Correct AnswerverifiedShow Answer

Type Ia supernovas involve a __________.

Correct AnswerverifiedShow Answer

_____ are hot compact remnant stars whose mass is typically between one and several times that of the Sun, but their size is only 10 km or less.

Correct AnswerverifiedShow Answer

White dwarfs have a surface composed of a thin layer of ____________.

Correct AnswerverifiedShow Answer

The escape velocity inside a black hole is

Correct AnswerverifiedShow Answer

The strong gravitational field of a white dwarf slows down the speed of escaping light, and results in the gravitational redshift.

Correct AnswerverifiedShow Answer

The mass of a black hole can be determined by _____________.

Correct AnswerverifiedShow Answer

Pulsars are rotating white dwarfs.

Correct AnswerverifiedShow Answer

Which of the following elements is NOT produced in a Type Ia supernova?

Correct AnswerverifiedShow Answer

White dwarfs have magnetic fields as much as 100 million times larger than Earth's magnetic field.

Correct AnswerverifiedShow Answer

A gravitational wave can carry energy away from two very dense objects if they are orbiting each other or collide.

Correct AnswerverifiedShow Answer

The law of conservation of angular momentum states that when an object of a fixed mass changes its radius R, its rotation velocity V will change so that

Correct AnswerverifiedShow Answer

An isolated black hole will

Correct AnswerverifiedShow Answer

This recurring event happens in the case of a binary system in which one of the companions is a neutron star.

Correct AnswerverifiedShow Answer

Why do white dwarfs have high temperatures?

Correct AnswerverifiedShow Answer

Millisecond pulsars rotate about ______ times per second.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified