SMT 314 - Introduction to Cosmology » Fall 2020 » HW 13
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Question #1
A red giant forms a [a] (two words) when its outer atmosphere becomes unstable, producing a gentle ejection of hydrogen and helium, while leaving a white dwarf. Our Sun will do this.
A.
emission nebula
B.
solar nebula
C.
reflection nebula
D.
planetary nebula
Question #2
In a binary system, a/an ____________ occurs when a lump of material is suddenly dumped onto the surface of a white dwarf and ignites, but does not destroy the white dwarf.
A.
fusion
B.
nebulae
C.
nova
D.
black hole
Question #3
A rapidly rotating neutron star having a strong magnetic field can sometimes be observed as a __________.
A.
white dwarf
B.
pulsar
C.
quasar
D.
neutron stars
Question #4
When a neutron star and a black hole combine into a larger black hole, _________________ ________________ (two words) are created and propagate through the fabric of space-time.
A.
electromagnetic waves
B.
gravitational pull
C.
electromagnetic force
D.
gravitational waves
Question #5
Mass exchange from one star to the other can occur if one star extends into the ________ ________ of its companion. (two words - may be case sensitive)
A.
Roche Lobe
B.
Lagrange point
C.
Roche Radius
D.
Center Mass
Question #6
A white dwarf shines because of ongoing nuclear fusion of heavy elements in its core.
A.
FALSE
B.
TRUE
Question #7
In the death phase, electron repulsion is sufficient to hold up a star of less than 1.4 solar masses against gravity. What dead star results?
A.
brown dwarf
B.
Black Hole
C.
neutron star
D.
white dwarf
Question #8
Inside a red supergiant, denser elements fuse and emit sufficient energy to balance thermal expansion versus gravity, until fusion of:
A.
silica & sulphur
B.
carbon & oxygen
C.
deuterium & tritium
D.
helium
E.
iron
Question #9
When a main-sequence star runs out of hydrogen fuel in its core,
A.
the core contracts and thus heats up.
B.
the core expands and thus cools down.
C.
the core expands and thus heats up.
D.
the core remains about the same size, but heats up as fusion of helium to carbon begins immediately after the hydrogen fuel is gone.
E.
the core contracts and thus cools down.
Question #10
Which of the following statements about supernovae is false?
A.
One kind of supernova occurs when iron core of a massive star collapses.
B.
At optical wavelengths, a supernova can appear about as bright as the entire galaxy of stars in which it's located.
C.
A supernova produces an expanding volume of gas that is rich in heavy elements.
D.
A neutron star is produced when a white dwarf exceeds a certain mass limit and becomes a supernova, experiencing a runaway chain of nuclear fusion reactions.
Question #11
White dwarf stars
A.
support themselves against the pull of gravity in the same way as normal stars link the Sun, using the pressure exerted by hot gases within them.
B.
consist largely of uranium and other very heavy elements.
C.
are the end states only of stars whose initial mass if much greater than that of the Sun.
D.
consist largely of carbon and oxygen.
E.
shine only while nuclear reactions continue within them.
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