Question 1

Complete the reaction: e + p → __ _____ ________; the reaction applies to ______ _____ _____.

Accepted Answer

A)  n, white dwarfs 
B)  ν, neutron stars 
C)  n + ν , white dwarfs 
D)  n + ν , neutron stars 
A)  n, white dwarfs 
B)  ν, neutron stars 
C)  n + ν , white dwarfs 
D)  n + ν , neutron stars

Question 2

The ___ _______ _ of a black hole is the radius from a black hole at which the escape velocity is approximately equal to the speed of light.

Accepted Answer

A)  Roche limit 
B)  Lagrangian point 
C)  Chandraskhar limit 
D)  Hubble radius 
E)  event horizon 
A)  Roche limit 
B)  Lagrangian point 
C)  Chandraskhar limit 
D)  Hubble radius 
E)  event horizon

Question 3

Which are compact objects?

Accepted Answer

A)  black holes 
B)  neutron stars 
C)  white dwarfs 
D)  All of the other choices are correct. 
A)  black holes 
B)  neutron stars 
C)  white dwarfs 
D)  All of the other choices are correct.

Question 4

The figure shows an image of an isolated black hole. A black hole emits

Accepted Answer

A)  light with wavelengths in the black color region. 
B)  no light from inside the event horizon. 
C)  light which is blueshifted to shorter wavelengths as it escapes. 
D)  light which is redshifted to shorter wavelengths as it escapes. 
A)  light with wavelengths in the black color region. 
B)  no light from inside the event horizon. 
C)  light which is blueshifted to shorter wavelengths as it escapes. 
D)  light which is redshifted to shorter wavelengths as it escapes.

Question 5

A pulsar wind is nearly entirely electromagnetic radiation.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

The event horizon marks the boundary within which the density is roughly the same as that of the atomic nucleus.

Accepted Answer

A) True 
 B)False

Question 8

When a binary system loses orbital energy, it emits ___ _____ _______ radiation.

Accepted Answer

The answer of When a binary system loses orbital energy,...

Question 9

Light that is shifted toward the color red due to the light passing very near a compact object is called ____________________.

Accepted Answer

gravitatio

Question 10

A black hole can be thought of as

Accepted Answer

A)  a very massive object of finite size. 
B)  a shell of material expanding from a white dwarf. 
C)  a massive body of infinitely small size. 
D)  a burnt out white dwarf. 
A)  a very massive object of finite size. 
B)  a shell of material expanding from a white dwarf. 
C)  a massive body of infinitely small size. 
D)  a burnt out white dwarf.

Question 11

At extremely high densities and temperatures, electrons can be forced to fuse with protons. This reaction produces

Accepted Answer

A)  hydrogen. 
B)  helium and energy. 
C)  degenerate electrons. 
D)  neutrons and neutrinos. 
E)  large amounts of radio radiation. 
A)  hydrogen. 
B)  helium and energy. 
C)  degenerate electrons. 
D)  neutrons and neutrinos. 
E)  large amounts of radio radiation.

Question 12

Rank the degenerate pressures from least supportive to most supportive:

Accepted Answer

A)  electron, neutron, black hole 
B)  black hole, neutron, electron 
C)  neutron, electron 
D)  electron, neutron 
A)  electron, neutron, black hole 
B)  black hole, neutron, electron 
C)  neutron, electron 
D)  electron, neutron

Question 13

If neutron stars contain no nuclear fuel, why are they hot?

Accepted Answer

Contraction heats the gas in a star. As

Question 14

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 15

The slowing of clocks in strongly curved space time is known as

Accepted Answer

A)  gravitational radiation. 
B)  time dilation. 
C)  gravitational curvature. 
D)  gravitational redshift. 
E)  hyperspace drag. 
A)  gravitational radiation. 
B)  time dilation. 
C)  gravitational curvature. 
D)  gravitational redshift. 
E)  hyperspace drag.

Question 16

LMC X-3 is a binary system that is believed to contain a black hole.

Accepted Answer

A) True 
 B)False

Question 17

The ____________________ theory describes pulsars as rotating neutron stars with strong magnetic fields that confine high-speed charged particles in two beams emanating from the magnetic poles of the neutron star.

Accepted Answer

The answer of The ____________________ theory describes pulsars as rotating...

Question 18

In the above graph of a pulsar in a binary, the motion of the pulsar from 2.75 hours to 3.5 hours is ___________________.

Accepted Answer

A)  moving away from Earth 
B)  moving towards Earth 
C)  in motion perpendicular to the line-of-sight 
D)  in motion perpendicular to the line-of-sight followed by motion towards Earth 
A)  moving away from Earth 
B)  moving towards Earth 
C)  in motion perpendicular to the line-of-sight 
D)  in motion perpendicular to the line-of-sight followed by motion towards Earth

Question 19

How fast does a pulsar initially spin?

Accepted Answer

A)  10 times per second 
B)  1 time per second 
C)  100 times per second 
D)  1000 times per second 
A)  10 times per second 
B)  1 time per second 
C)  100 times per second 
D)  1000 times per second

Complete the reaction: e + p → _ __; the reaction applies to _ ___.

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

Which are compact objects?

The figure shows an image of an isolated black hole. A black hole emits

A pulsar wind is nearly entirely electromagnetic radiation.

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

The event horizon marks the boundary within which the density is roughly the same as that of the atomic nucleus.

When a binary system loses orbital energy, it emits _ _ _____ radiation.

Light that is shifted toward the color red due to the light passing very near a compact object is called ____________________.

A black hole can be thought of as

At extremely high densities and temperatures, electrons can be forced to fuse with protons. This reaction produces

Rank the degenerate pressures from least supportive to most supportive:

If neutron stars contain no nuclear fuel, why are they hot?

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

The slowing of clocks in strongly curved space time is known as

LMC X-3 is a binary system that is believed to contain a black hole.

The ____________________ theory describes pulsars as rotating neutron stars with strong magnetic fields that confine high-speed charged particles in two beams emanating from the magnetic poles of the neutron star.

In the above graph of a pulsar in a binary, the motion of the pulsar from 2.75 hours to 3.5 hours is ___________________.

How fast does a pulsar initially spin?

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

Complete the reaction: e + p → __ _____ ________; the reaction applies to ______ _____ _____.

The ___ _______ _ of a black hole is the radius from a black hole at which the escape velocity is approximately equal to the speed of light.

Which are compact objects?

The figure shows an image of an isolated black hole. A black hole emits

A pulsar wind is nearly entirely electromagnetic radiation.

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

The event horizon marks the boundary within which the density is roughly the same as that of the atomic nucleus.

When a binary system loses orbital energy, it emits ___ _____ _______ radiation.

Light that is shifted toward the color red due to the light passing very near a compact object is called ____________________.

A black hole can be thought of as

At extremely high densities and temperatures, electrons can be forced to fuse with protons. This reaction produces

Rank the degenerate pressures from least supportive to most supportive:

If neutron stars contain no nuclear fuel, why are they hot?

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

The slowing of clocks in strongly curved space time is known as

LMC X-3 is a binary system that is believed to contain a black hole.

The ____________________ theory describes pulsars as rotating neutron stars with strong magnetic fields that confine high-speed charged particles in two beams emanating from the magnetic poles of the neutron star.

In the above graph of a pulsar in a binary, the motion of the pulsar from 2.75 hours to 3.5 hours is ___________________.

How fast does a pulsar initially spin?

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

Complete the reaction: e + p → _ __; the reaction applies to _ ___.

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

When a binary system loses orbital energy, it emits _ _ _____ radiation.