Question 1

All gamma- ray bursters have the same fundamental driving mechanism, although we don't yet know whether it is a hypernova or a merger of two neutrons stars.

Accepted Answer

A) True 
 B)False

Question 2

Why is Cygnus X- 1 considered such a good black hole candidate?

Accepted Answer

The massive visible star is pulled aroun...

Question 3

Neutron stars do NOT have

Accepted Answer

A)   masses greater than 1.4 solar masses.
B)   strong magnetic fields.
C)   rotation periods comparable to the Sun's.
D)   sizes comparable to large cities.
E)   large surface gravities, compared to the Sun.F) B) and E)
G) B) and D)

Question 4

The "pulse" from a pulsar is due to the rapidly expanding and contracting outer shell of the star.

Accepted Answer

A) True 
 B)False

Question 5

Most pulsars have a measured mass of

Accepted Answer

A)   between 2 and 4 solar masses.
B)   greater than 10 solar masses.
C)   about 1.4 solar masses.
D)   less than 1.0 solar masses.
E)   5.2 solar masses.F) B) and C)
G) A) and E)

Question 6

From a distance of 1 AU, the gravity of a three- solar- mass star is _ _ the gravity of a lower- limit stellar black hole.

Accepted Answer

The answer of From a distance of 1 AU, the...

Question 7

In a hypernova, a very energetic supernova creates a

Accepted Answer

A)   set of planets to orbit their neutron star host.
B)   millisecond pulsar.
C)   very visible supernova remnant.
D)   black hole.
E)   white dwarf and its planetary nebula.F) D) and E)
G) A) and E)

Question 8

What can we detect from matter that has crossed an event horizon?

Accepted Answer

A)   X- rays if the matter was dense
B)   visible light
C)   gamma- ray bursts
D)   radio waves if the matter was traveling fast enough
E)   nothingF) B) and E)
G) A) and B)

Question 9

Mass added to a pulsar from its companion can speed it up into a(n) pulsar.

Accepted Answer

The answer of Mass added to a pulsar from its...

Question 10

A neutron star is what can remain after a Type II supernova explosion has destroyed the rest of the star.

Accepted Answer

A) True 
 B)False

Question 11

What is meant by the event horizon?

Accepted Answer

When a mass has contracted to a certain ...

Question 12

Relate escape velocity to the event horizon.

Accepted Answer

At the event horizon around a ...

Question 13

An object more massive than the Sun, but roughly the size of a city, is a

Accepted Answer

A)   red dwarf.
B)   neutron star.
C)   white dwarf.
D)   black dwarf.
E)   brown dwarf.F) A) and E)
G) A) and D)

Question 14

Who discovered the first four pulsars?

Accepted Answer

A)   Carl Sagan
B)   Jocelyn Bell
C)   Anthony Hewish
D)   Stephen Hawking
E)   Martin SchwartzschildF) B) and C)
G) C) and D)

Question 15

stars are solid, extremely dense objects.

Accepted Answer

A)   Neutron
B)   Proton
C)   X- ray
D)   Electron
E)   Wolf- RayetF) D) and E)
G) A) and B)

Question 16

Two- thirds of all known millisecond pulsars are found in what type of object?

Accepted Answer

A)   open clusters
B)   globular clusters
C)   extremely distant galaxies
D)   emission nebulae
E)   giant molecular cloudsF) B) and E)
G) All of the above

Question 17

Neutron stars have

Accepted Answer

A)   periods of days or weeks.
B)   weak or non- existent magnetic fields.
C)   monopolar fields that switch polarity every rotation.
D)   very strong bipolar magnetic fields.
E)   no relation to pulsars.F) B) and D)
G) D) and E)

Question 18

A supernova remnant, such as the Crab nebula, is heated by the

Accepted Answer

pulsar win...

Question 19

Planets similar to our Jovians have been found orbiting pulsars.

Accepted Answer

A) True 
 B)False

Question 20

All pulsars are neutron stars; why is the reverse NOT true?

Accepted Answer

Most neutron stars have slowed...

Exam 14: Neutron Stars and Black Holes: Strange States of Matter

What can we detect from matter that has crossed an event horizon?

Correct AnswerverifiedShow Answer

A supernova remnant, such as the Crab nebula, is heated by the

Correct Answerverifiedpulsar win...View AnswerShow Answer

What is meant by the event horizon?

Correct AnswerverifiedWhen a mass has contracted to a certain ...View AnswerShow Answer

All pulsars are neutron stars; why is the reverse NOT true?

Correct AnswerverifiedMost neutron stars have slowed...View AnswerShow Answer

Neutron stars do NOT have

Correct AnswerverifiedShow Answer

Planets similar to our Jovians have been found orbiting pulsars.

Correct AnswerverifiedShow Answer

In a hypernova, a very energetic supernova creates a

Correct AnswerverifiedShow Answer

Two- thirds of all known millisecond pulsars are found in what type of object?

Correct AnswerverifiedShow Answer

stars are solid, extremely dense objects.

Correct AnswerverifiedShow Answer

An object more massive than the Sun, but roughly the size of a city, is a

Correct AnswerverifiedShow Answer

Relate escape velocity to the event horizon.

Correct AnswerverifiedAt the event horizon around a ...View AnswerShow Answer

The "pulse" from a pulsar is due to the rapidly expanding and contracting outer shell of the star.

Correct AnswerverifiedShow Answer

Mass added to a pulsar from its companion can speed it up into a(n) pulsar.

Correct AnswerverifiedShow Answer

Why is Cygnus X- 1 considered such a good black hole candidate?

Correct AnswerverifiedThe massive visible star is pulled aroun...View AnswerShow Answer

Most pulsars have a measured mass of

Correct AnswerverifiedShow Answer

Neutron stars have

Correct AnswerverifiedShow Answer

From a distance of 1 AU, the gravity of a three- solar- mass star is _ _ the gravity of a lower- limit stellar black hole.

Correct AnswerverifiedShow Answer

A neutron star is what can remain after a Type II supernova explosion has destroyed the rest of the star.

Correct AnswerverifiedShow Answer

All gamma- ray bursters have the same fundamental driving mechanism, although we don't yet know whether it is a hypernova or a merger of two neutrons stars.

Correct AnswerverifiedShow Answer

Who discovered the first four pulsars?

Correct AnswerverifiedShow Answer

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pulsar win...
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When a mass has contracted to a certain ...
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Most neutron stars have slowed...
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At the event horizon around a ...
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The massive visible star is pulled aroun...
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