Question 1

Most pulsars are known only as radio sources, but a few of the younger ones, like the Crab and Vela, also give off visible and even X- ray energy.

Accepted Answer

A) True 
 B)False

Question 2

Two important properties of young neutron stars are

Accepted Answer

A)   extremely slow rotation and a strong magnetic field.
B)   extremely rapid rotation and a strong magnetic field.
C)   extremely rapid rotation and a weak magnetic field.
D)   no rotation and a weak magnetic field.
E)   no rotation and no magnetic field.

Question 3

A proposed explanation for gamma- ray bursters is

Accepted Answer

A)   coalescence of a neutron star binary.
B)   hypernova- making black holes and bipolar jets.
C)   collisions between two white dwarfs.
D)   Both A and B are possible.
E)   All three are possible.

Question 4

As a spaceship's velocity gets closer to the speed of light with respect to an external observer, that observer will report that

Accepted Answer

A)   its length will decrease and its clock will run more slowly.
B)   its length will decrease and its clock will run faster.
C)   its length will increase and its clock will run more slowly.
D)   its length will increase and its clock will run faster.
E)   None of these will happen.

Question 5

Pulsars are created in a Type I supernova.

Accepted Answer

A) True 
 B)False

Question 6

Geminga pulses strongly in gamma rays, and may be the closest neutron star. Why is it unusual?

Accepted Answer

It gives off no observed radio...

Question 7

Which are the two most popular candidates for gamma- ray bursters?

Accepted Answer

A)   mergers of two black holes, and merger of a neutron star and a white dwarf
B)   collisions between a white dwarf and a giant, and merger of two neutron stars
C)   formation of uranium in the core of a supergiant, and collisions of white dwarfs
D)   hypernova making pulsars, and mergers of two white dwarfs
E)   hypernova making a black hole, and merger of two neutron stars E

Question 8

A neutron star rapidly.

Accepted Answer

The answer of A neutron star rapidly....

Question 9

What makes the Crab Nebula pulsar unusual among other pulsars?

Accepted Answer

A)   It is a magnetar, with far more intense magnetic fields than any other.
B)   Its period is much less regular than other pulsars.
C)   It is the fastest spinning known pulsar.
D)   It is relatively bright in shorter wavelengths, like visible and X- rays.
E)   It is the oldest known pulsar.

Question 10

The burst of X- rays from an X- ray burster is due to _ of hydrogen on its surface.

Accepted Answer

The answer of The burst of X- rays from an...

Question 11

What does it take to allow us to observe a neutron star as a pulsar?

Accepted Answer

The neutron star must be still spinning ...

Question 12

A hypernova is a gamma- ray burster that forms a black hole as well.

Accepted Answer

A) True 
 B)False  True

Question 13

Type supernovae produce no neutron stars, only ejected debris.

Accepted Answer

The answer of Type supernovae produce no neutron stars, only...

Question 14

Millisecond pulsars are never members of close binary systems.

Accepted Answer

A) True 
 B)False  False

Question 15

A neutron star detectable by its rapid rotation and strong magnetic field is a(n) .

Accepted Answer

The answer of A neutron star detectable by its rapid...

Question 16

A black hole can be created in a(n) , even more violent than supernovae.

Accepted Answer

The answer of A black hole can be created in...

Question 17

The hypernova model is one possible explanation for _.

Accepted Answer

The answer of The hypernova model is one possible explanation...

Question 18

The supernova that created the Crab nebula and its pulsar was seen on Earth in the year

Accepted Answer

A)   1604 BC.
B)   1054 BC.
C)   1054 AD.
D)   1592 AD.
E)   1604 AD.

Question 19

Why is the light from near a black hole redshifted?

Accepted Answer

The gravity is great enough to...

Question 20

Even if a probe were in a stable orbit near a black hole, we would still observe its signals redshifted by the gravitational field of the black hole.

Accepted Answer

A) True 
 B)False

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

Most pulsars are known only as radio sources, but a few of the younger ones, like the Crab and Vela, also give off visible and even X- ray energy.

Correct AnswerverifiedShow Answer

Two important properties of young neutron stars are

Correct AnswerverifiedShow Answer

A proposed explanation for gamma- ray bursters is

Correct AnswerverifiedShow Answer

As a spaceship's velocity gets closer to the speed of light with respect to an external observer, that observer will report that

Correct AnswerverifiedShow Answer

Pulsars are created in a Type I supernova.

Correct AnswerverifiedShow Answer

Geminga pulses strongly in gamma rays, and may be the closest neutron star. Why is it unusual?

Correct AnswerverifiedIt gives off no observed radio...View AnswerShow Answer

Which are the two most popular candidates for gamma- ray bursters?

Correct AnswerverifiedE

A neutron star rapidly.

Correct AnswerverifiedShow Answer

What makes the Crab Nebula pulsar unusual among other pulsars?

Correct AnswerverifiedShow Answer

The burst of X- rays from an X- ray burster is due to _ of hydrogen on its surface.

Correct AnswerverifiedShow Answer

What does it take to allow us to observe a neutron star as a pulsar?

Correct AnswerverifiedThe neutron star must be still spinning ...View AnswerShow Answer

A hypernova is a gamma- ray burster that forms a black hole as well.

Correct AnswerverifiedTrue

Type supernovae produce no neutron stars, only ejected debris.

Correct AnswerverifiedShow Answer

Millisecond pulsars are never members of close binary systems.

Correct AnswerverifiedFalse

A neutron star detectable by its rapid rotation and strong magnetic field is a(n) .

Correct AnswerverifiedShow Answer

A black hole can be created in a(n) , even more violent than supernovae.

Correct AnswerverifiedShow Answer

The hypernova model is one possible explanation for _.

Correct AnswerverifiedShow Answer

The supernova that created the Crab nebula and its pulsar was seen on Earth in the year

Correct AnswerverifiedShow Answer

Why is the light from near a black hole redshifted?

Correct AnswerverifiedThe gravity is great enough to...View AnswerShow Answer

Even if a probe were in a stable orbit near a black hole, we would still observe its signals redshifted by the gravitational field of the black hole.

Correct AnswerverifiedShow Answer

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It gives off no observed radio...
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E

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The neutron star must be still spinning ...
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True

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False

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The gravity is great enough to...
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