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Chapter 12
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1. Using information in the back of your
textbook, determine the parallax angle to the
very closest star.
a) 0.23 arcsec
b) 4.23 arcsec
c) 0.77 arcsec
d) 1.30 arcsec
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2. Consider two stars in the constellation Pasta
Major: alpha Tortellini (bright in the UV, dim in the IR)
beta Linguini (dim in the UV, bright in the IR)
Which star is hotter?
a) alpha Tortellini
b) beta Linguini
c) too little information to answer
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3. Star A has a radius R and a temperature T.
Star B has the same temperature and is at the
same distance from the Sun as star A. However,
it is 4 times larger than star A. How many times
more luminous is star B?
a) 16
b) 4
c) both have the same luminosity
d) not enough information to tell
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4. Star A has a radius R and a temperature T.
Star B is at the same distance from the Sun as
star A. However, it is 4 times larger than star A
and two times cooler. How many times more
luminous is star B?
a) 16
b) 4
c) both have the same luminosity
d) not enough information to tell
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Chapter 13
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5.What causes the red color? 6.The cone shaped object is
a) Cold dust and gas
a) Hydrogen emission
obscuring radiation
b) Hydrogen absorption
c) Doppler shifted radiation b) Bi-polar jet
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7. The nebulae around protostars are shaped into
disks because of the same process that causes
dough to become flat when it is
a) spun in the air like pizza dough
b) rolled with a pin like pizza dough
c) squashed between plates like dough for
a burrito
d) baked on a flat sheet like a cookie.
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8. The factors that tend to work against collapse are
I. The magnetic field of the cloud
II. The presence of a supernova nearby
III. The existence of molecules in the gas
IV. Heat in the gas
V. rotation of the cloud
a) I, III, V
b) I, IV, V
c) II, III, V
d) II, IV, V
e) III, IV, V
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9. A B0 Main Sequence star is 17.5 times more
massive than the Sun and 30,000 times more
luminous. Such a star will spend approximately
_____ years on the Main Sequence.
a) 30,000
b) 6 million
c) 1,700
d) 1.7x1013
e) 17.5x1013
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A
10. Youngest to oldest:
a) B, C, A
b) A, C, B
c) C, A, B
d) C, B, A
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B
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C
11. Which of the following sequences correctly
describes the evolution of the Sun from young to old?
a) white dwarf, red giant, main sequence,
protostar
b) red giant, main-sequence, white dwarf,
protostar
c) protostar, red giant, main sequence, white
dwarf
d) protostar, main sequence, white dwarf, red
giant
e) protostar, main sequence, red giant, white
dwarf
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12. Stars like the Sun probably do not form iron
cores during their evolution because
a) all of the iron is ejected when they become
planetary nebulae
b) their cores never get hot enough for them to
make iron by nucleosynthesis
c) the iron they make by nucleosynthesis is all
fused into carbon
d) their strong magnetic fields keep their iron
in the atmosphere
e) none of the above
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1. C
2. A
3. A
4. C
5. A
6. A
7. A
8. B
9. B
10.D
11.E
12.B
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