# Pt1420 Unit 21 Quiz

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Pt1420 Unit 21 Quiz
Multiple Choice (Answer all 40 Questions)
Type in the letter that represents your best answer to the corresponding question from the original final exam document.

1. B
2. E
3. D
4. D
5. B

6. A
7. D
8. B
9. C
10. B

11. A
12. C
13. A
14. C
15. A

16. C
17. C
18. C
19. D
20. D

21. B
22. D
23. A
24. C
25. D

26. C
27. A
28. E
29. E
30. C

31. A
32. D
33. A
34. A
35. C

36. A
37. E
38. D
39. C
40. D

Problems (Answer all six Questions)
Complete these answers in your own words. Follow instructions in the Final Examination document. Answer all questions according to the instructions. Number each question here according to its number in the Final Examination document provided by your
…show more content…
(a) Kepler’s 3rd law
P^2 = a^3 (P = period in years; a = distance in AU)
75^2 = a^3 a = (75^2)^(1/3) = 17.78 AU.

(b) The further comets are from the sun, the slower they travel; therefore, it spends longer at the further distance.

2. (a) Star B is farther away. Its parallax is less. The closer a star is, the more its position changes against the background as the earth revolves around the sun. That is what parallax is. (b) 20 parsecs. (One parsec = distance at which a star has a parallax of 1 arcsecond) Since this parallax is 1/20 as large, its distance is 20 times greater.

(c) 65.2 light years. (1 parsec = 3.26 ly * 20)

3. (a) 10m would have the greater light gathering power

(b) Both of the telescopes are in vacuum. The 10m one has area Pi r ^2, with r = 5m and the 2m one has r = 1. The ratio of Pi 5^2/Pi 1^2 = 25. Twenty-five times more light falls onto the large telescope.

(c) The 10m telescope has a “Greater” light gathering power.

(d) The factor would be about 25 times the light gathering
…show more content…
Cosmic Microwave Background (CMB): This is the result of theorized energetics, which was discovered in 1965 by Penzias and Wilson. Their discovery showed microwave radiation emanating from all directions in our observable locality of the universe. As predicted by the Big Bang Model, the universe is filled with plasma at high temperatures. As a result, hydrogen can only exit as plasma with an ambient temperature of about 3000K.

c. Primordial abundance of light elements: This is the observed abundance of elements in the universe. Examinations through the spectra of various objects shows us that helium makes up about 23% of observable mass in the universe, which is entirely too large to be accounted for by stellar fusion. Since stellar nucleosynthesis makes the abundance of lighter nuclei hard to explain, the Big Bang model theorizes that the nuclei were created during the fierce

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