x2samp - Astro 250 - practice Exam 1 page 1 Astro 250 -...

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ASTRO 250 -- EXAM 2 (sample) This exam has two parts. In Part I , indicate the best answer to the question directly on the question sheet. In Part II , write your answer in the space provided. Partial credit will be given if it looks like you are on the right track, or if you have the basic idea but do not give sufficient detail. Note that the sum of total possible points is 102. GOOD LUCK --- and RTFQ USEFUL FORMULAE V=H o d ! =rho/rho-crit t " 2/(3Ho) #$ / $ = v/c Z = $ observed / $ emitted –1 E=mc 2 c =3x10 10 cm/s 1 Mpc = 10 6 pc = 3x10 5 km/s PART I: MULTIPLE CHOICE: 22 questions, 3 points each. Select the best answer to each of the questions below. Indicate your answer on this sheet. 1. The giant galaxy M87 is 3 times farther away than the spiral galaxy M51. The velocity of M87 will be ___________ times ___________ than the velocity of Galaxy B with respect to the Milky Way. a) 3 ; smaller b) 3 ; bigger c) 9 ; smaller d) 9 ; bigger e) none of the above 2. Most of the matter of the universe is a) undetected by any means. b) in the form of energy. c) matter that exerts gravitational force, but is otherwise completely hidden. d) composed of stars and gas. e) is visible in some region of the electromagnetic spectrum. 3. The diameter of the disk of our galaxy is closest to _____ parsec(s), or about _____ light years. a) 1 ; 3.26 b) 100 ; 326 c) 1,000 ; 3260 d) 18,000 ; 53,000 e) 30,000 ; 100,000 4. If the density of the universe is less than the critical density the universe will a) stop expanding only after an infinite amount of time has passed. b) eventually stop expanding and begin contracting. c) eventually stop contracting and begin expanding. d) continue to contract forever. e) continue to expand forever. Astro 250 - practice Exam 1 page 1 5. What percentage of the mass of the universe was formed into helium during the Big Bang? a) much less than 1% b) 10% c) 25% d) 75% e) 90% 6. Spectra of distant galaxies show a) a large red shift. b) a large blue shift.
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x2samp - Astro 250 - practice Exam 1 page 1 Astro 250 -...

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