Question 1

The density of a __ _____ __ is greater than the density of a __ _____ __.

Accepted Answer

A)  white dwarf; neutron star 
B)  neutron star; black hole 
C)  pulsar; neutron star 
D)  pulsar; white dwarf 
E)  white dwarf; black hole 
A)  white dwarf; neutron star 
B)  neutron star; black hole 
C)  pulsar; neutron star 
D)  pulsar; white dwarf 
E)  white dwarf; black hole

Question 2

Similar to our Sun, pulsars' rotations are believed to slow down because

Accepted Answer

A)  they are losing angular momentum into space via outward streaming particles. 
B)  they are dragging companion stars around in their magnetic field. 
C)  they are getting tired. 
D)  of conservation of angular momentum. 
E)  their mass is increasing. 
A)  they are losing angular momentum into space via outward streaming particles. 
B)  they are dragging companion stars around in their magnetic field. 
C)  they are getting tired. 
D)  of conservation of angular momentum. 
E)  their mass is increasing.

Question 3

In the lighthouse model shown above, the light from the lighthouse sweeps out a region in the sky, representing a disk around a pulsar.

Accepted Answer

A) True 
 B)False

Question 4

An isolated black hole in empty intergalactic space would be difficult to detect because

Accepted Answer

A)  there would be no stars behind it whose light would be affected by gravitational lensing. 
B)  it could not emit light from inside its event horizon. 
C)  no companion stars would be affected by its gravitational field. 
D)  no matter would be falling into it to create an X-ray-emitting accretion disk. 
E)  All of the other choices are correct. 
A)  there would be no stars behind it whose light would be affected by gravitational lensing. 
B)  it could not emit light from inside its event horizon. 
C)  no companion stars would be affected by its gravitational field. 
D)  no matter would be falling into it to create an X-ray-emitting accretion disk. 
E)  All of the other choices are correct.

Question 5

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 6

The singularity of a black hole

Accepted Answer

A)  is found outside the event horizon. 
B)  is located within the event horizon. 
C)  can only be located if the black hole is in a binary system. 
D)  doesn't exist since all black holes have a finite size. 
A)  is found outside the event horizon. 
B)  is located within the event horizon. 
C)  can only be located if the black hole is in a binary system. 
D)  doesn't exist since all black holes have a finite size.

Question 7

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 8

The calculated Schwarzschild radius of a 2-   black hole is approximately

Accepted Answer

A)  6 km. 
B)  4 km. 
C)  2 km. 
D)  12 km. 
E)  36 km. 
A)  6 km. 
B)  4 km. 
C)  2 km. 
D)  12 km. 
E)  36 km.

Question 9

Neutron stars have densities roughly the same as that of the atomic nucleus.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

The most widely accepted calculations su

Question 11

In the above cartoon of an astronaut traveling to a black hole in, the black hole is located above the person's head according to the text.

Accepted Answer

A) True 
 B)False

Question 12

A __ _____ __ has a radius of about 10 km and is supported by the pressure associated with degenerate neutrons.

Accepted Answer

A)  black hole 
B)  neutron star 
C)  white dwarf 
D)  supernova remnant 
E)  red dwarf 
A)  black hole 
B)  neutron star 
C)  white dwarf 
D)  supernova remnant 
E)  red dwarf

Question 13

An object of zero radius is known as a __________________.

Accepted Answer

The answer of An object of zero radius is known...

Question 14

Many pulsars have periods that are gradually getting longer as the spinning neutron stars lose energy.

Accepted Answer

A) True 
 B)False

Question 15

The object left behind after the 1054 AD supernova explosion has been observed at the center of the Crab nebula. The object is a

Accepted Answer

A)  white dwarf. 
B)  neutron star. 
C)  red giant. 
D)  protostar. 
A)  white dwarf. 
B)  neutron star. 
C)  red giant. 
D)  protostar.

Question 16

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 17

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

Accepted Answer

A) True 
 B)False

Question 18

Cygnus X-1 and LMC X-3 are black holes if the masses of the unseen companions perhaps may be

Accepted Answer

A)  less than 3 solar masses. 
B)  more than 3 solar masses. 
C)  between 0.4 and 1.4 solar masses. 
D)  less than 0.4 solar masses. 
E)  not larger than the masses of the stars that we can see. 
A)  less than 3 solar masses. 
B)  more than 3 solar masses. 
C)  between 0.4 and 1.4 solar masses. 
D)  less than 0.4 solar masses. 
E)  not larger than the masses of the stars that we can see.

Question 19

If the Sun and stars are supported by gas pressure, what supports a neutron star?

Accepted Answer

Neutron de

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 density of a _ is greater than the density of a _ .

Similar to our Sun, pulsars' rotations are believed to slow down because

In the lighthouse model shown above, the light from the lighthouse sweeps out a region in the sky, representing a disk around a pulsar.

An isolated black hole in empty intergalactic space would be difficult to detect because

The size of a neutron star is

The singularity of a black hole

Neutron stars are expected to spin rapidly because

The calculated Schwarzschild radius of a 2- black hole is approximately

Neutron stars have densities roughly the same as that of the atomic nucleus.

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

In the above cartoon of an astronaut traveling to a black hole in, the black hole is located above the person's head according to the text.

A _ has a radius of about 10 km and is supported by the pressure associated with degenerate neutrons.

An object of zero radius is known as a __________________.

Many pulsars have periods that are gradually getting longer as the spinning neutron stars lose energy.

The object left behind after the 1054 AD supernova explosion has been observed at the center of the Crab nebula. The object is a

The density of a neutron star is

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

Cygnus X-1 and LMC X-3 are black holes if the masses of the unseen companions perhaps may be

If the Sun and stars are supported by gas pressure, what supports a neutron star?

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

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

The density of a __ _____ __ is greater than the density of a __ _____ __.

Similar to our Sun, pulsars' rotations are believed to slow down because

In the lighthouse model shown above, the light from the lighthouse sweeps out a region in the sky, representing a disk around a pulsar.

An isolated black hole in empty intergalactic space would be difficult to detect because

The size of a neutron star is

The singularity of a black hole

Neutron stars are expected to spin rapidly because

The calculated Schwarzschild radius of a 2- black hole is approximately

Neutron stars have densities roughly the same as that of the atomic nucleus.

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

In the above cartoon of an astronaut traveling to a black hole in, the black hole is located above the person's head according to the text.

A __ _____ __ has a radius of about 10 km and is supported by the pressure associated with degenerate neutrons.

An object of zero radius is known as a __________________.

Many pulsars have periods that are gradually getting longer as the spinning neutron stars lose energy.

The object left behind after the 1054 AD supernova explosion has been observed at the center of the Crab nebula. The object is a

The density of a neutron star is

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

Cygnus X-1 and LMC X-3 are black holes if the masses of the unseen companions perhaps may be

If the Sun and stars are supported by gas pressure, what supports a neutron star?

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

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

The density of a _ is greater than the density of a _ .

A _ has a radius of about 10 km and is supported by the pressure associated with degenerate neutrons.