Exam I-Spg08-answs-v12fa

Exam I-Spg08-answs-v12fa - NAME: _Weinstein_ STD....

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NAME: ___Weinstein_______________ STD. #____000-0000_________ ASTRONOMY, PHYSICS 122 EXAM 1 Feb. 15, 2008 Be sure to print your name and student number on the front page. Please remove all books and papers from your desk. The exam is closed book . For questions requiring brief answers or fill-in- the-blank, write legibly and be concise. For questions involving multiple choice, circle the letter of the one correct answer. For true/false questions, circle T or F in front of each listed possibility. For numerical problems, show all of your work to get the most partial credit. Total time is 50 min . Total points are 200 . !!Good Luck!! !!Good Luck!! Fill in the blanks and/or circle the correct choice in each of the underlined phrases . 1. (10pts.) The spiral arms of the Milky Way are caused by density or shock waves, which trigger the formation of new stars as the arms rotate rapidly/slowly around the disk. The arms are illuminated by spiral __ tracers ____, which often are Population I/II stars, of the Spectral Types O & B/G & K . 2. (12pts.) Hubble/Shapley determined the size of the Milky Way by measuring the distance to open/globular clusters in the halo/disk using the oscillation period of binary/Cepheid variable stars. He found that the Milky Way is roughly 75,000 ly in diameter, and that its center is about 8.5kiloparsecs/8.5megaparsecs away from our sun toward the constellation _ Sagittarius _____. 3. (12 pts.) The Milky Way is a spiral galaxy whose main parts are the disk, nuclear bulge, and halo as shown in the figure at right. Which of these galaxy components is MOST likely to contain the following objects? Primarily old metal poor stars __ halo __________ Dense dust and molecular clouds _ disk/nuclear bulge Many Type O and B stars _ disk/nuclear bulge Massive ( > 2x10 6 M O ) black hole _ nuclear bulge ___ Stars with tipped highly elliptical orbits _ halo _________ In our local galaxy cluster, the two largest spirals are the Milky Way and __ Andromeda _______. 4. (12pts.) The rotation curve of a spiral galaxy is a plot of the orbital _ velocity/speed in the disk as a function of the radius/distance from the galactic center. The rotation curve can be determined by measuring the _ Doppler ___ _ shift/effect __ of spectral lines from stars and nebulae in the galaxy.
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This note was uploaded on 04/25/2008 for the course PHY 122 taught by Professor Bernstein during the Spring '08 term at SUNY Buffalo.

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Exam I-Spg08-answs-v12fa - NAME: _Weinstein_ STD....

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