Astronomy 10
Fall 2007
Midterm 3, In-class activity 22, 11/8-13 CPS
(Posted 071115)
1. (Q7.2)
e = ee = 3.0 points
2. (Q7.1)
a = ee = 3.0 points
3. (Q8.4)
b = dd = 3.0 points
4. (Q9.1)
c = cc = 3.0 points
5. (Q9.5)
a = cc = 3.0 points
6. (M3.1)
b = cc = 3.0 points
7. (M3.2)
a = aa = 3.0 points
8. (M3.3)
b = bb = 3.0 points
9. (M3.4)
b = bb = 3.0 points
10. (M3.5)
b = dd = 3.0 points
=====
(For the short-answer questions, refer to the grading comments below for
specific details as to what these letters mean.)
=====
11. (Q8.5)
p = 15/15: Correct. Wien's law says that same color (i.e., same peak
wavelength) means same temperature. The Stefan-Boltzmann law says that for the
same temperature, a brighter luminosity corresponds to a larger size. Thus the
statement is true. (May only implicitly utilize one of the two laws in
discussion.)
r = 12/15: Nearly correct (explanation weak, unclear or only nearly complete);
includes extraneous/tangential information; or has minor errors. Understands
that the two stars must have the same temperature, but typically misapplies the
Stefan-Boltzmann law.
t = 9/15: Contains right ideas, but discussion is unclear/incomplete or contains
major errors. At least attempts some systematic application of Wien's law
and/or the Stefan-Boltzmann law.
v = 6/15: Limited relevant discussion of supporting evidence of at least some
merit, but in an inconsistent or unclear manner. May involve discussion of
apparent versus absolute magnitude.
x = 3/15: Implementation/application of ideas, but credit given for effort
rather than merit.
y = 1.5/15: Irrelevant discussion/effectively blank.
z = 0/15: Blank.
=====
12. (Q9.5)
p = 15/15: Correct. Understands that low mass stars evolve slower than massive
stars, and that since they have reached the main sequence line, after the
massive stars have come and left, this must be a very old star cluster. May use
the "party" analogy, or turnoff point on main sequence line.
r = 12/15: Nearly correct (explanation weak, unclear or only nearly complete);
includes extraneous/tangential information; or has minor errors.
t = 9/15: Contains right ideas, but discussion is unclear/incomplete or contains
major errors. At least understands evolutionary stages of stars, but determines
cluster to be very young.
v = 6/15: Limited relevant discussion of supporting evidence of at least some
merit, but in an inconsistent or unclear manner. Argument based on temperature
or luminosity of stars.
x = 3/15: Implementation/application of ideas, but credit given for effort
rather than merit.
y = 1.5/15: Irrelevant discussion/effectively blank.
z = 0/15: Blank.
=====
13. (M3.4)
p = 15/15: Correct. In its supergiant phase, heavier and heavier elements are
fused until the core becomes (degeneratively packed) iron, which requires more
energy to be put in than can be released from fusing it into yet heavier
elements. Without an energy source to balance gravity, the superigant lifetime
of the massive star ends (the core implodes during neutronization, and the outer
layers fall onto and rebound off of the core, causing a type II supernova
explosion).
r = 12/15: Nearly correct (explanation weak, unclear or only nearly complete);
includes extraneous/tangential information; or has minor errors. Understands
how the supergiant lifetime of a massive star occurs, but does not completely
explains _why_ it must end.
t = 9/15: Contains right ideas, but discussion is unclear/incomplete or contains
major errors.
v = 6/15: Limited relevant discussion of supporting evidence of at least some
merit, but in an inconsistent or unclear manner.
x = 3/15: Implementation/application of ideas, but credit given for effort
rather than merit.
y = 1.5/15: Irrelevant discussion/effectively blank.
z = 0/15: Blank.
=====
Midterm 3 average = 46.9/75
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 MT3 A22 CPS
0594 d a b c a b a b b b v r p 60 3.0 6.0
0907 e a b c d b a b b b p p r 69 2.4 6.3
0929 d e d c a e a b a b t p r 51 2.6 6.0
1002 aa ee bb bb bb ee bb cc bb dd t p r 45 2.4 2.4
1009 ee dd dd cc cc bb bb ee ee aa t p r 48 3.0 6.3
1127 bb dd ee aa cc ee ee bb cc bb v x x 18 0 0
1285 a a c c d a b a b e t t r 39 3.0 2.4
1336 bb bb dd cc cc bb aa cc bb aa p p p 60 3.0 6.3
1338 b a b c a b a b b c p p p 69 3.0 6.3
1447 aa aa cc cc aa ee bb ee dd dd p p r 48 3.0 6.0
1524 aa aa ee dd cc bb dd bb bb bb p r p 51 3.0 6.3
1591 ee ee aa cc bb cc ee cc bb cc t p r 51 2.6 2.4
1689 bb ee bb dd dd bb bb dd ee bb v v v 21 0 2.1
1929 dd bb cc cc bb bb dd dd bb bb r t p 42 3.0 0
1982 a c a c a c a b d b p p r 57 0 6.0
1985 e a e e a e a c d b v v y 28.5 2.6 6.3
2001 e a e c d b a b b e p t r 57 3.0 6.3
2182 0 2.1
2301 ee ee ee cc aa cc ee cc dd cc r p r 51 3.0 2.4
2328 e a a c d e b c c e p t r 45 3.0 6.0
2408 a b d e c c e d a a v p v 27 3.0 5.1
2735 ee ee aa cc bb ee aa cc dd ee p p r 54 3.0 6.3
3518 e c b c d e d c d d p r r 48 3.0 3.9
3685 dd ee cc cc aa ee aa dd cc bb r p r 48 3.0 6.3
4136 ee ee dd cc cc cc aa bb aa dd p p p 72 3.0 5.1
4380 a a a d b b b d d c v p t 36 3.0 6.0
4503 c c b c d c a c e d v p t 39 0 2.4
4566 e a b c a b a b b b p p r 72 3.0 6.3
4571 bb bb dd cc bb ee aa cc ee cc v r r 39 3.0 6.3
5656 bb dd ee cc bb cc cc cc ee dd t t r 39 3.0 6.3
6158 ee ee ee ee aa ee aa cc dd bb t v v 30 2.4 0
6379 aa bb aa dd aa ee bb cc bb dd t v z 21 3.0
7649 e b a c a b d d b c p t t 48 2.6 6.3
7779 b a c c a e d b c a p v r 45 3.0 6.3
8002 a b b c a b c d d b v p t 45 2.6 6.3
9389 ee ee aa cc bb cc aa bb bb dd p p p 69 3.0 6.3
NOTES:
*Do not forget your Astr 10 PIN number!
*The cumulative class CPS review score was 78%, which means no double
participation bonus for the review.
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