Astro 1:Practice Final 1 (Winter 08)

Astro 1:Practice Final 1 (Winter 08) - UNIVERSITY OF...

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UNIVERSITY OF CALIFORNIA, SANTA BARBARA Department of Physics Astronomy 1 Winter 2006 Prof. R. Antonucci FINAL EXAM 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 Scan-Tron 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 Scan-Tron form. To avoid possible mistakes, we suggest that you don’t fill in the Scan-Tron form until you have decided on your answers to all questions. This is a closed book , closed notes exam. You may use a calculator, however. Do not start until told to do so. Most importantly, note the color of your exam on the top of the Scan-Tron form. If you WILL ALLOW your exam left out in a box for pickup, please SIGN your Scan- Tron Form. Some formulae of possible interest: Conversion of mass to energy: E = mc2, where c = 3 × 10 8 m/sec Doppler effect: λ Δ = c v Energy of a photon: ν h E = , where h 1 × 10 -34 J × s Kepler’s Third Law: P 2 a 3 Total radiation of blackbody per unit area per unit time: E = _T4 “Stefan-Boltzmann Law” Peak of blackbody spectrum: λ max = 2.9×10 -3 m / T “Wein’s Law” Fg = G 2 2 1 d m m Surface area of a sphere = 4 π R 2 ; Volume of a sphere 4 π / 3 R 3 F= L / 4 π d 2 One light year 1.0 × 10 16 m; One pc 3 × 10 16 m The Sun’s luminosity = 4 × 10 26 Joules/sec Hubble’s Law: v = H 0 d L = 4 π d 2 F 1m = 10 6 microns = 10 9 nm = 10 10 Å νλ = c c = 3 × 10 5 km/sec Small angle formula: size = angular size in arcsec / 206,265 × distance
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1. One astronomical unit, or one AU is defined as the A. distance traveled by light in one year. B. mean distance between the Sun and the Earth. C. distance from which Earth-Sun distance will subtend an angle of one arcsecond. D. distance traveled by light in one second. 2. Which effect has been useful (and successful) in the search for and identification of black holes in the universe? A. their magnetic fields B. the effect of their angular momentum or spin on nearby matter. C. the influence of their intense gravitational field on atoms which are emitting light from the event horizons of the black holes. D. their gravitational influence on nearby matter, particularly companion stars. 3. An Earthling here at home and an Alien on another planet, orbiting another star, observe the spectrum of a gas cloud. The Alien detects an absorption spectrum. The Earthling detects an emission spectrum. What conclusion can be reached? A. This is possible. The Earthling looked at the gas cloud with a hot object behind it; the Alien looked at it from a different angle with no hot object behind it. B. This is possible. The Alien looked at the gas cloud with a hot object behind it
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This homework help was uploaded on 04/07/2008 for the course ASTRO 1 taught by Professor Antonucci during the Winter '08 term at UCSB.

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Astro 1:Practice Final 1 (Winter 08) - UNIVERSITY OF...

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