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WorksheetsNeutron Stars & Black Holes
Total questions: 17
Worksheet time: 17mins
Some examples of which type of dying star exhibit rapid pulses that were originally suspected to be communications from extraterrestrials?
white dwarf.
black hole.
neutron star.
What kind of stellar remnant involves a rapidly spinning ball of neutrons?
neutron star.
black hole.
white dwarf.
The average density of neutron stars approaches
a million times that of normal matter.
a million times that of even a white dwarf.
about 10^17 kg/m3, similar to the density of atomic nuclei.
about 10^18 times that of water.
infinity.
Pulsars usually show ALL of the following except
extremely rapid rotation.
high temperature fusion reactions.
a narrow regular pulse of radiation.
high speed motion through the Galaxy.
an intense magnetic field.
The lighthouse model explains how
pulsars can be used as interstellar navigation beacons.
the period of pulsation increases as a neutron star collapses.
pulsars have their rotation axis pointing toward Earth.
a rotating neutron star generates an observable beam of light.
Many millisecond pulsars lie within
emission nebulae.
giant molecular clouds.
globular clusters.
planetary nebulae.
open clusters.
One possible explanation for a gamma-ray burst is
matter spiraling into a large black hole.
the collision of neutron stars in a binary system.
variations in the magnetic fields of a pulsar.
repeated nova explosions.
In contrasting the distribution of the X-ray and gamma-ray bursts, we find that
gamma-ray bursts are far closer to us, so they appear more luminous.
gamma-ray bursts are far beyond our Galaxy, at cosmological distances, and spread all over the sky, not in the plane of our Galaxy.
gamma-ray bursts are more closely associated with open than globular clusters.
gamma-ray bursts can repeat, while the X-ray bursts do not.
gamma-ray bursts can be observed from the ground, but X-rays are blocked by the ionosphere for ground-based observers.
What kind of remnant disappears from the observable universe?
white dwarf.
neutron star.
black hole.
What is the final fate of the most massive stars?
white dwarf.
neutron star.
black hole.
The region around a black hole from which no radiation can escape is called the
event horizon.
singularity.
embedding diagram.
X-ray binary.
Roche limit.
The event horizon of a black hole
is the point where X-rays emerge.
is the physical surface of the hole.
defines the outer edge of an accretion disk.
is measured by the Schwarzschild radius.
extends for millions of miles into space.
What explanation does general relativity provide for gravity?
gravity is the weakest of the four universal forces.
gravity is a result of curved spacetime.
gravity is directly proportional to mass.
gravity is inversely proportional to radius.
The force of gravity can pull on
a beam of light.
a massive object.
neutrinos.
antimatter.
all of the these.
The observed slowing of a clock in the vicinity of a black hole is a prediction of
the Roche limit.
special relativity.
general relativity.
stellar nucleosynthesis.
the Cosmological Principle.
If the sun was replaced by a one-solar-mass black hole
Earth’s orbit would not change.
Earth would be pulled into the black hole.
X-rays would destroy Earth.
Earth would be torn apart from the tidal force.
life would be unchanged.
Cygnus X-1 is
NASA’s latest X-ray orbiting telescope.
a millisecond pulsar with three planets.
the strongest X-ray eclipsing binary system.
a likely black hole binary-star system.
) the first gamma-ray burst spotted in X-rays.
