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Questions
Chapter 13
Neutron Stars
and Black Holes
Copyright © 2010 Pearson Education, Inc.
Question 1
Pulsars usually
show all of the
following EXCEPT
Copyright © 2010 Pearson Education, Inc.
a) extremely rapid rotation.
b) high-temperature fusion reactions.
c) a narrow regular pulse of radiation.
d) high-speed motion through the galaxy.
e) an intense magnetic field.
Question 1
Pulsars usually
show all of the
following
EXCEPT
a) extremely rapid rotation.
b) high-temperature fusion reactions.
c) a narrow regular pulse of radiation.
d) high-speed motion through the galaxy.
e) an intense magnetic field.
Pulsars are neutron stars no
longer undergoing fusion in
their cores.
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Question 2
Many millisecond
pulsars lie within
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a) emission nebulae.
b) giant molecular clouds.
c) globular clusters.
d) planetary nebulae.
e) open clusters.
Question 2
Many millisecond
pulsars lie within
a) emission nebulae.
b) giant molecular clouds.
c) globular clusters.
d) planetary nebulae.
e) open clusters.
The cores of globular clusters are
densely packed with stars,
suggesting that millisecond pulsars
might result from “spinning up” as a
result of stellar encounters.
The core of globular cluster 47 Tucanae
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Question 3
The lighthouse
model explains
how
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a) pulsars can be used as interstellar
navigation beacons.
b) the period of pulsation increases as a
neutron star collapses.
c) pulsars have their rotation axis pointing
toward Earth.
d) a rotating neutron star generates an
observable beam of light.
Question 3
The lighthouse
model explains
how
Copyright © 2010 Pearson Education, Inc.
a) pulsars can be used as interstellar
navigation beacons.
b) the period of pulsation increases as a
neutron star collapses.
c) pulsars have their rotation axis pointing
toward Earth.
d) a rotating neutron star generates an
observable beam of light.
Question 4
One possible
explanation for a
gamma-ray
burster is
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a) matter spiraling into a large black
hole.
b) the collision of neutron stars in a
binary system.
c) variations in the magnetic fields of
a pulsar.
d) repeated nova explosions.
e) All of the above are possible.
Question 4
One possible
explanation for a
gamma-ray
burster is
a) matter spiraling into a large black
hole.
b) the collision of neutron stars in a
binary system.
c) variations in the magnetic fields of
a pulsar.
d) repeated nova explosions.
e) All of the above are possible.
Gamma-ray bursts vary in
length, and the coalescence of
two neutron stars seems to
account for short bursts.
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Question 5
Cygnus X-1 is
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a) NASA’s latest X-ray orbiting telescope.
b) a millisecond pulsar with three planets.
c) the strongest X-ray eclipsing binary system.
d) a likely black hole binary star system.
e) the first gamma-ray burster spotted in X rays.
Question 5
Cygnus X-1 is
a) NASA’s latest X-ray orbiting telescope.
b) a millisecond pulsar with three planets.
c) the strongest X-ray eclipsing binary system.
d) a likely black hole binary star system.
e) the first gamma-ray burster spotted in X rays.
Cygnus X-1 is an X-ray source with
one visible star orbited by an unseen
companion of at least 10 solar
masses, and very rapid changes in the
signal indicating a small source.
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Question 6
The force of gravity
can pull on
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a) a beam of light.
b) a massive object.
c) neutrinos.
d) antimatter.
e) All of the above are correct.
Question 6
The force of gravity
can pull on
a) a beam of light.
b) a massive object.
c) neutrinos.
d) antimatter.
e) All of the above are correct.
Gravity is described by
general relativity as a
bending of space, and all
particles, including photons,
move through warped space
along curved paths.
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Question 7
If the sun was
replaced by a
one-solar-mass
black hole
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a) Earth’s orbit would not change.
b) Earth would be pulled into the
black hole.
c) X rays would destroy Earth.
d) Earth would be torn apart from the
tidal force.
e) life would be unchanged.
Question 7
If the sun was
replaced by a
one-solar-mass
black hole
a) Earth’s orbit would not change.
b) Earth would be pulled into the
black hole.
c) X rays would destroy Earth.
d) Earth would be torn apart from the
tidal force.
e) life would be unchanged.
The force of gravity depends only on mass and
distance, not the type of matter, or its size.
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Question 8
The event horizon
of a black hole
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a) is the point where X rays emerge.
b) is the physical surface of the hole.
c) defines the outer edge of an accretion
disk.
d) is measured by the Schwarzschild
radius.
e) extends for millions of miles into
space.
Question 8
The event horizon
of a black hole
a) is the point where X rays emerge.
b) is the physical surface of the hole.
c) defines the outer edge of an accretion
disk.
d) is measured by the Schwarzschild
radius.
e) extends for millions of miles into
space.
The event horizon is the surface of an
imaginary sphere around a collapsed
object inside of which nothing,
including light, can escape.
Copyright © 2010 Pearson Education, Inc.