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.
reflection nebula
B.
emission nebula
C.
solar 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.
nova
B.
fusion
C.
nebulae
D.
black hole
Question #3
A rapidly rotating neutron star having a strong magnetic field can sometimes be observed as a __________.
A.
pulsar
B.
neutron stars
C.
quasar
D.
white dwarf
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 waves
C.
gravitational pull
D.
electromagnetic force
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.
Center Mass
B.
Lagrange point
C.
Roche Lobe
D.
Roche Radius
Question #6
A white dwarf shines because of ongoing nuclear fusion of heavy elements in its core.
A.
TRUE
B.
FALSE
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.
neutron star
C.
Black Hole
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.
deuterium & tritium
B.
carbon & oxygen
C.
helium
D.
iron
E.
silica & sulphur
Question #9
When a main-sequence star runs out of hydrogen fuel in its core,
A.
the core remains about the same size, but heats up as fusion of helium to carbon begins immediately after the hydrogen fuel is gone.
B.
the core contracts and thus cools down.
C.
the core contracts and thus heats up.
D.
the core expands and thus cools down.
E.
the core expands and thus heats up.
Question #10
Which of the following statements about supernovae is false?
A.
A supernova produces an expanding volume of gas that is rich in heavy elements.
B.
At optical wavelengths, a supernova can appear about as bright as the entire galaxy of stars in which it's located.
C.
One kind of supernova occurs when iron core of a massive star collapses.
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.
consist largely of carbon and oxygen.
B.
are the end states only of stars whose initial mass if much greater than that of the Sun.
C.
shine only while nuclear reactions continue within them.
D.
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.
E.
consist largely of uranium and other very heavy elements.
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