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Salem State University Sample test ANSWER SHEET T/F #25 corrected to F for
2n test Stars & Stellar Evolution March 18, 2013 in PHS 207 Astronomy 2013
Prof. Frank Nigh --- Instructor [email protected] 1 of 3 pages
ANSWER SHEET corrected T/F #25 to F
Answers to Multiple choice questions
41
1A
11 D
21 A
31 A
A&E
2B
12 E
22 E
32 D
42 A
3C
13 D
23 A
33 C
43 B
4E
14 C
24 D
34 C
44 C
5C
15 D
25 B
35 C
45 D
6A
16 E
26 D
36 C
46 D
7B
17 A
27 D
37 D
47 C
8E
18 D
28 E
38 B
48 C
9C
19 C
29 B
39 E
10 B
20 D
30 B
40 A
Fill in the Blank
1. hydrostatic equilibrium
2. degenerate
3. planetary nebulae
4. by convection
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Salem State University Sample test ANSWER SHEET T/F #25 corrected to F for
2n test Stars & Stellar Evolution March 18, 2013 in PHS 207 Astronomy 2013
Prof. Frank Nigh --- Instructor [email protected] 2 of 3 pages
Answers to True/False questions
1F
11 T
21 F
2T
12 F
22 F
3T
13 T
23 F
4T
14 T
24 T
5F
15 F
25 F
6F
16 T
26 T
7F
17 T
27 F
8T
18 T
28 T
9T
19 F
29 T
10 T
20 T
30 T
31 T
ANSWERS TO ESSAY QUESTIONS
1. The parallax angle would be larger and easier to observe, because the known side of the right
triangle (in the parallax determination) would be larger.
2. The giants are above the radii of the main sequence stars.
3. The higher temperature produces great luminosity as seen in the H-R Diagram.
4. The spectra (spectral absorption lines) is more narrow because the pressure in the giants is
less than in the main sequence stars.
5. According the Cosmic Ladder (which we have not studied in detail, but we will), spectroscopic
parallax, Cepheids (pulsating period stars), supernovae, and Hubble’s Law, offer means to
measure distances beyond 100 pc (which is during considered the parallax and parsec limit).
6. Low mass stars are more numerous according the H-R Diagram.
7. Nuclear fusion can only occur where there is sufficient temperature and pressure. This occurs
in a star core where both are largest and most concentrated.
8. As the temperature rises, the star’s gas will expand lowering the gas’s temperature. When
the temperature is less the gas will contract.
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Salem State University Sample test ANSWER SHEET T/F #25 corrected to F for
2n test Stars & Stellar Evolution March 18, 2013 in PHS 207 Astronomy 2013
Prof. Frank Nigh --- Instructor [email protected] 3 of 3 pages
9. When the pressure is low, a gas absorption line will be narrower than when the pressure is
larger. In instellar medium (ISM) where there is not sufficient gravity to force the materials of
the ISM to contract, the pressure will be lower than in a star or on most planets.
10. There is larger nuclear fusion (more energy and emission) in a high mass due to gravity
increasing the pressure and raising the temperature than in a low mass star(like our Sun).
11. When there is not sufficient mass, nuclear fusion will not develop and no star emission. We
will see that Jupiter is very warm, but it is not large enough to be a star.
12. A mistaken repeat of question #7.
13. A white dwarf will not have exhausted its potential carbon fuel, but there is not sufficient
gravity to compress its carbon nuclei and electrons further. So there will be emission but not
sufficient to be a very luminous star given its size (slight bigger than our Sun).
14. A nova is fusion on the surface (not at the core of a white dwarf) causing a much much
larger luminosity than its size would predict. A supernova is either an exploding massive
star(type II) or a dwarf taking in the exploding material from a neighboring star (type I). a few
supernova so powerful that it has been seen even while our Sun is shining.
Number
Constellation
Prominent
Star
Arcturus
Number
1
Bootes
2
Canes Venatici
12
3
Corona
Borealis
13
Serpens
Caput
Ophiuchus
4
Corvus
14
Puppis
5
Crater
6
Hydra
7
8
Coma
Berenices
Lyra
9
Libra
10
Hercules
11
Constellation Prominent
Star
Virgo
Spica
Vega
THE END OF THE ANSWER SHEET
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