Question 1

Pulsars could not be ordinary stars that are pulsating because the pulses are too short.

Accepted Answer

A) True 
 B)False

Question 2

When a star of mass comparable to the Sun dies it become a black hole.

Accepted Answer

A) True 
 B)False

Question 3

Gamma-ray bursts lasting longer than two seconds appear to be related to ______________.

Accepted Answer

The answer of Gamma-ray bursts lasting longer than two seconds...

Question 4

Why does our theory predict that neutron stars will have strong magnetic fields?

Accepted Answer

All stars have magnetic fields, and some

Question 5

The mass of a neutron star is

Accepted Answer

A)  several time that of the Sun. 
B)  about the same as that of the Sun. 
C)  about the same as Earth. 
D)  smaller than any of these. 
A)  several time that of the Sun. 
B)  about the same as that of the Sun. 
C)  about the same as Earth. 
D)  smaller than any of these.

Question 6

The escape velocity of an object depends on
I. the mass of that object.
II. the mass of the object trying to escape.
III. the distance from the center of the object and the escaping object.
IV. the speed of light.

Accepted Answer

A)  I, II, III, & IV 
B)  I & II 
C)  I & III 
D)  I, II, & IV 
E)  I, III, & IV 
A)  I, II, III, & IV 
B)  I & II 
C)  I & III 
D)  I, II, & IV 
E)  I, III, & IV

Question 7

Gamma-ray bursts seem to be associated with violent events involving _______________.

Accepted Answer

A)  planets 
B)  neutron stars 
C)  black holes 
D)  neutron stars or black holes 
A)  planets 
B)  neutron stars 
C)  black holes 
D)  neutron stars or black holes

Question 8

Energy lost by an isolated pulsar is carried away by a __ _____ ______.

Accepted Answer

The answer of Energy lost by an isolated pulsar is...

Question 9

What is the shape of the event horizon?

Accepted Answer

A)  circle 
B)  line 
C)  sphere 
D)  square 
A)  circle 
B)  line 
C)  sphere 
D)  square

Question 10

Hypernovae are

Accepted Answer

A)  supernovae that occur when two red dwarfs collide. 
B)  supernovae that occur when 10-solar-mass stars explode. 
C)  supernovae that occur when stars more massive than 25 solar masses explode. 
D)  one theory to explain the production of gamma-ray bursters. 
E)  supernovae that occur when stars more massive than 25 solar masses explode and one theory to explain the production of gamma-ray bursters. 
A)  supernovae that occur when two red dwarfs collide. 
B)  supernovae that occur when 10-solar-mass stars explode. 
C)  supernovae that occur when stars more massive than 25 solar masses explode. 
D)  one theory to explain the production of gamma-ray bursters. 
E)  supernovae that occur when stars more massive than 25 solar masses explode and one theory to explain the production of gamma-ray bursters.

Question 11

What evidence do we have that pulsars are neutron stars?

Accepted Answer

Pulsars could not be ordinary stars. A n

Question 12

A(n) ____________________ is a rapidly spinning neutron star that accelerates charged particles near the poles of its magnetic field.

Accepted Answer

The answer of A(n) ____________________ is a rapidly spinning neutron...

Question 13

What happens when a core's density exceeds that which electron degeneracy pressure can support?

Accepted Answer

A)  The core collapses to a black hole. 
B)  The core collapses to a neutron star. 
C)  The core collapses to a white dwarf. 
D)  The core collapses to a neutron star or a black hole. 
A)  The core collapses to a black hole. 
B)  The core collapses to a neutron star. 
C)  The core collapses to a white dwarf. 
D)  The core collapses to a neutron star or a black hole.

Question 14

What happens when a core's mass is less than 3 solar masses but greater than 1.44 solar masses?

Accepted Answer

A)  Electron degeneracy pressure can no longer support the core and the electrons combine with the protons to generate neutrons and neutrinos, the neutrinos of which supply neutron degeneracy pressure to support the neutron star. 
B)  Electron degeneracy pressure can no longer support the core and the electrons combine with the protons to generate neutrons and neutrinos, the neutrons of which supply neutron degeneracy pressure to support the neutron star. 
C)  Electron degeneracy pressure supports the core of the white dwarf. 
D)  Electron degeneracy pressure can no longer support the core and the electrons combine with the protons to generate neutrons and neutrinos, the neutrinos of which supply neutron degeneracy pressure to support the black hole star. 
A)  Electron degeneracy pressure can no longer support the core and the electrons combine with the protons to generate neutrons and neutrinos, the neutrinos of which supply neutron degeneracy pressure to support the neutron star. 
B)  Electron degeneracy pressure can no longer support the core and the electrons combine with the protons to generate neutrons and neutrinos, the neutrons of which supply neutron degeneracy pressure to support the neutron star. 
C)  Electron degeneracy pressure supports the core of the white dwarf. 
D)  Electron degeneracy pressure can no longer support the core and the electrons combine with the protons to generate neutrons and neutrinos, the neutrinos of which supply neutron degeneracy pressure to support the black hole star.

Question 15

The event horizon

Accepted Answer

A)  is believed to be a singularity. 
B)  is a crystalline layer. 
C)  has a radius equal to the Schwarzschild radius. 
D)  marks the inner boundary of a planetary nebula. 
E)  is located at the point where synchrotron radiation is created around a pulsar. 
A)  is believed to be a singularity. 
B)  is a crystalline layer. 
C)  has a radius equal to the Schwarzschild radius. 
D)  marks the inner boundary of a planetary nebula. 
E)  is located at the point where synchrotron radiation is created around a pulsar.

Question 16

The above cartoon is of a neutron star with a strong magnetic field. We call this a pulsar planet.

Accepted Answer

A) True 
 B)False

Question 17

Theory predicts that neutron stars may not exceed 3 solar masses.

Accepted Answer

A) True 
 B)False

Question 18

___ _____ _ are neutron stars that have magnetic fields 100 times stronger than the average neutron star.

Accepted Answer

A)  Hypernovae 
B)  Collapsars 
C)  Pulsars 
D)  Kerr singularities 
E)  Magnetars 
A)  Hypernovae 
B)  Collapsars 
C)  Pulsars 
D)  Kerr singularities 
E)  Magnetars

Question 19

Using the graph above of a pulsar in a binary orbit, what is the orbital period?

Accepted Answer

A)  ˜6.75 hours 
B)  ˜5 hours 
C)  ˜12 hours 
D)  ˜3.5 hours 
A)  ˜6.75 hours 
B)  ˜5 hours 
C)  ˜12 hours 
D)  ˜3.5 hours

Question 20

Fraud in science is rare because it is difficult to commit. Why is it difficult to commit fraud in science?

Accepted Answer

A)  Science requires that experimental and theoretical findings be reproducible. 
B)  All scientists are bound by a code of ethics preventing them from publishing fraudulent work. 
C)  Scientific results are reviewed by other scientists before they are published. 
D)  Scientific journals only allow certain highly trusted individuals to publish their work. 
E)  Science requires that experimental and theoretical findings be reproducible and scientific results are reviewed by other scientists before they are published. 
A)  Science requires that experimental and theoretical findings be reproducible. 
B)  All scientists are bound by a code of ethics preventing them from publishing fraudulent work. 
C)  Scientific results are reviewed by other scientists before they are published. 
D)  Scientific journals only allow certain highly trusted individuals to publish their work. 
E)  Science requires that experimental and theoretical findings be reproducible and scientific results are reviewed by other scientists before they are published.

Pulsars could not be ordinary stars that are pulsating because the pulses are too short.

When a star of mass comparable to the Sun dies it become a black hole.

Gamma-ray bursts lasting longer than two seconds appear to be related to ______________.

Why does our theory predict that neutron stars will have strong magnetic fields?

The mass of a neutron star is

The escape velocity of an object depends on I. the mass of that object. II. the mass of the object trying to escape. III. the distance from the center of the object and the escaping object. IV. the speed of light.

Gamma-ray bursts seem to be associated with violent events involving _______________.

Energy lost by an isolated pulsar is carried away by a _ ____.

What is the shape of the event horizon?

Hypernovae are

What evidence do we have that pulsars are neutron stars?

A(n) ____________________ is a rapidly spinning neutron star that accelerates charged particles near the poles of its magnetic field.

What happens when a core's density exceeds that which electron degeneracy pressure can support?

What happens when a core's mass is less than 3 solar masses but greater than 1.44 solar masses?

The event horizon

The above cartoon is of a neutron star with a strong magnetic field. We call this a pulsar planet.

Theory predicts that neutron stars may not exceed 3 solar masses.

_ ___ _ are neutron stars that have magnetic fields 100 times stronger than the average neutron star.

Using the graph above of a pulsar in a binary orbit, what is the orbital period?

Fraud in science is rare because it is difficult to commit. Why is it difficult to commit fraud in science?

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 11: Neutron Stars and Black Holes

Pulsars could not be ordinary stars that are pulsating because the pulses are too short.

When a star of mass comparable to the Sun dies it become a black hole.

Gamma-ray bursts lasting longer than two seconds appear to be related to ______________.

Why does our theory predict that neutron stars will have strong magnetic fields?

The mass of a neutron star is

The escape velocity of an object depends on I. the mass of that object. II. the mass of the object trying to escape. III. the distance from the center of the object and the escaping object. IV. the speed of light.

Gamma-ray bursts seem to be associated with violent events involving _______________.

Energy lost by an isolated pulsar is carried away by a __ _____ ______.

What is the shape of the event horizon?

Hypernovae are

What evidence do we have that pulsars are neutron stars?

A(n) ____________________ is a rapidly spinning neutron star that accelerates charged particles near the poles of its magnetic field.

What happens when a core's density exceeds that which electron degeneracy pressure can support?

What happens when a core's mass is less than 3 solar masses but greater than 1.44 solar masses?

The event horizon

The above cartoon is of a neutron star with a strong magnetic field. We call this a pulsar planet.

Theory predicts that neutron stars may not exceed 3 solar masses.

___ _____ _ are neutron stars that have magnetic fields 100 times stronger than the average neutron star.

Using the graph above of a pulsar in a binary orbit, what is the orbital period?

Fraud in science is rare because it is difficult to commit. Why is it difficult to commit fraud in science?

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Energy lost by an isolated pulsar is carried away by a _ ____.

_ ___ _ are neutron stars that have magnetic fields 100 times stronger than the average neutron star.