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Unformatted text preview: UNIVERSITY OF CALIFORNIA, SANTA BARBARA Department of Physics Astronomy 1 MIDTERM EXAM Prof. R. Antonucci Monday, 3 May 2004 Spring 2004 Make sure that the person on either side of you has a different colored exam from yours. Answer each question by filling in the appropriate block on your scantron form, using a No. 2 pencil only. For each question give the one best answer. There is no penalty for guessing, so be sure you give an answer for every question. Be absolutely sure that you print your name on your scantron form. To avoid possible mistakes, we suggest that you dont fill in the scantron form until you have decided on your answers to all questions. This is a closed book, closed notes exam. You may, however, use a calculator. Do not start until told to do so. Most importantly, note the version of your exam at the bottom of the scantron form . Some formulae of possible interest: Conversion of mass to energy: E = mc 2 Doppler effect: v c = Energy of photon: E = h Keplers Third Law: P 2 a 3 Total radiation flux of blackbody per unit area per unit time (Stefan-Boltzmann Law): F = T 4 Peak of blackbody spectrum (Wiens Law): max = 2 . 9 10- 3 m K T Newtons Law of Universal Gravitation F g = G m 1 m 2 d 2 where G = 6 . 67 10- 11 Nm 2 / kg 2 in our mks metric units Surface area of a sphere = 4 R 2 1 m = 10 6 microns = 10 9 nm = c c = 3 10 8 m s F = ma 1 pc 3 light years 3 10 16 m Distance to Moon: 400,000 km or 240,000 mi h = 6 . 62 10- 34 Joule-seconds Small angle formula: D d 200 , 000 for in arcseconds; d is the distance = 5 . 7 10- 8 W / m 2 K 4 in our mks metric units Luminosity = (surface area A) (Energy Flux per unit area E). If you wish to receive your test back in a publically accessible place, be sure to sign your scantron form. Version: A 1 1. Which is characteristic of a terresterial planet? a) Its large and warm b) Its far from the sun c) Its dense like a rock or metal d) Its made mostly of H and He e) It has no solid surface. 2. A scientist reports a measurement of the temperature of the surface of a newly discov- ered planet is- 20 K. What conclusion can you draw from this report? a) The scientist measured only the dark side of the planet, away from the Sun. b) The planet is a very long way from the Sun. c) The result is meaningless and erroneous and the scientist may be crazy....
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