Question 1

The ____________________ of a black hole in a binary system can emit X-rays and allow us to detect the presence of the black hole.

Accepted Answer

The answer of The ____________________ of a black hole in...

Question 2

A scientific theory can be proven true if the correct experiments are performed.

Accepted Answer

A) True 
 B)False

Question 3

Why might we suspect that a black hole in a binary system could emit X-rays?

Accepted Answer

The answer of Why might we suspect that a black...

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

Neutron stars are expected to spin rapidly because

Accepted Answer

A)  they conserved angular momentum when they collapsed. 
B)  they have high orbital velocities. 
C)  they have high densities. 
D)  they have high temperatures. 
E)  the energy from the supernova explosion that formed them made them spin faster. 
A)  they conserved angular momentum when they collapsed. 
B)  they have high orbital velocities. 
C)  they have high densities. 
D)  they have high temperatures. 
E)  the energy from the supernova explosion that formed them made them spin faster.

Question 6

We expect neutron stars to spin rapidly because they conserve angular momentum.

Accepted Answer

A) True 
 B)False

Question 7

The density of a neutron star is

Accepted Answer

A)  about the same as that of a white dwarf. 
B)  about the same as that of the sun. 
C)  about the same as an atomic nucleus. 
D)  zero. 
A)  about the same as that of a white dwarf. 
B)  about the same as that of the sun. 
C)  about the same as an atomic nucleus. 
D)  zero.

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

Which of the following objects is considered to possibly contain a black hole?

Accepted Answer

A)  the central star of the Crab nebula 
B)  the Orion nebula. 
C)  LMC X-3 
D)  Algol 
E)  PSR 1257+12 
A)  the central star of the Crab nebula 
B)  the Orion nebula. 
C)  LMC X-3 
D)  Algol 
E)  PSR 1257+12

Question 10

If the accretion disk around a black hole emits X-rays outside the event horizon, the X-rays can escape.

Accepted Answer

A) True 
 B)False

Question 11

____ occurs when light travels out of a gravitational field, loses energy, and its wavelength grows longer.

Accepted Answer

A)  A gravitational blue shift 
B)  The solar wind 
C)  A gravitational redshift 
D)  A X-ray burst 
E)  A pulsar wind 
A)  A gravitational blue shift 
B)  The solar wind 
C)  A gravitational redshift 
D)  A X-ray burst 
E)  A pulsar wind

Question 12

The size of a neutron star is

Accepted Answer

A)  about the same as that of our Solar System. 
B)  about the same as that of the sun. 
C)  about the same as Earth. 
D)  smaller than any of these. 
A)  about the same as that of our Solar System. 
B)  about the same as that of the sun. 
C)  about the same as Earth. 
D)  smaller than any of these.

Question 13

____ 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 14

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 15

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)  a and c above. 
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)  a and c above.

Question 16

The search for black holes involves searching for

Accepted Answer

A)  single stars that emit large amounts of X-rays. 
B)  X-ray binaries where the compact companion has a mass in excess of 3. 
C)  large spherical regions from which no light is detected. 
D)  pulsars with periods less than one millisecond. 
E)  pulsars that are orbited by planets. 
A)  single stars that emit large amounts of X-rays. 
B)  X-ray binaries where the compact companion has a mass in excess of 3. 
C)  large spherical regions from which no light is detected. 
D)  pulsars with periods less than one millisecond. 
E)  pulsars that are orbited by planets.

Question 17

The material that accretes onto a neutron star or black hole is expected to emit X-rays because

Accepted Answer

A)  the material will produce synchrotron radiation. 
B)  hydrogen nuclei begin to fuse and emit high-energy photons. 
C)  the material will become hot enough that it will radiate most strongly at X-ray wavelengths. 
D)  as the material slows down it converts thermal energy to gravitational potential energy. 
E)  none of the above. 
A)  the material will produce synchrotron radiation. 
B)  hydrogen nuclei begin to fuse and emit high-energy photons. 
C)  the material will become hot enough that it will radiate most strongly at X-ray wavelengths. 
D)  as the material slows down it converts thermal energy to gravitational potential energy. 
E)  none of the above.

Question 18

Why do we not expect to find a 5-solar-mass neutron star?

Accepted Answer

The answer of Why do we not expect to find...

Question 19

To tell the difference between a neutron star and a black hole in an X-ray binary, we must find the temperature of the object.

Accepted Answer

A) True 
 B)False

Question 20

The ____________________ of a black hole is the radius from the black hole at which the escape velocity is equal to the speed of light.

Accepted Answer

event hori

The ____________________ of a black hole in a binary system can emit X-rays and allow us to detect the presence of the black hole.

A scientific theory can be proven true if the correct experiments are performed.

Why might we suspect that a black hole in a binary system could emit X-rays?

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

Neutron stars are expected to spin rapidly because

We expect neutron stars to spin rapidly because they conserve angular momentum.

The density of a neutron star is

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

Which of the following objects is considered to possibly contain a black hole?

If the accretion disk around a black hole emits X-rays outside the event horizon, the X-rays can escape.

____ occurs when light travels out of a gravitational field, loses energy, and its wavelength grows longer.

The size of a neutron star is

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

The mass of a neutron star is

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

The search for black holes involves searching for

The material that accretes onto a neutron star or black hole is expected to emit X-rays because

Why do we not expect to find a 5-solar-mass neutron star?

To tell the difference between a neutron star and a black hole in an X-ray binary, we must find the temperature of the object.

The ____________________ of a black hole is the radius from the black hole at which the escape velocity is equal to the speed of light.

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

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

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Exam 11: Neutron Stars and Black Holes

The ____________________ of a black hole in a binary system can emit X-rays and allow us to detect the presence of the black hole.

A scientific theory can be proven true if the correct experiments are performed.

Why might we suspect that a black hole in a binary system could emit X-rays?

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

Neutron stars are expected to spin rapidly because

We expect neutron stars to spin rapidly because they conserve angular momentum.

The density of a neutron star is

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

Which of the following objects is considered to possibly contain a black hole?

If the accretion disk around a black hole emits X-rays outside the event horizon, the X-rays can escape.

____ occurs when light travels out of a gravitational field, loses energy, and its wavelength grows longer.

The size of a neutron star is

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

The mass of a neutron star is

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

The search for black holes involves searching for

The material that accretes onto a neutron star or black hole is expected to emit X-rays because

Why do we not expect to find a 5-solar-mass neutron star?

To tell the difference between a neutron star and a black hole in an X-ray binary, we must find the temperature of the object.

The ____________________ of a black hole is the radius from the black hole at which the escape velocity is equal to the speed of light.

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

The Origin of the Solar System

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