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Unformatted text preview: AST 203: Extra Credit for Midterm #1 Due in class, just before the exam, on Thurs. Mar. 3, 2011 The exams in this class will consist of several short answer (essay) questions followed by several quantitative questions covering the material from class, the reading, and the homework. Below you will find the quantitative questions from last year’s exam. This is intended to help you prepare for the exam. Students will be awarded up to 1 point of extra credit (applied to the total course grade—see the syllabus) for correctly answering these questions and handing in your solutions immediately before the exam in class. 5. Blackbodies Consider two stars: star 1 has a surface temperature of T 1 = 12000 K; star 2 has a surface temperature of T 2 = 5000 K. a. If the two stars have the same radii, what is the ratio of their luminosities? b. If instead the ratio of the radii were R 2 /R 1 = 10, what is the ratio of their luminosities?...
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 Spring '08
 Simon,M
 Astronomy, Astronomical unit, quantitative questions, Rydberg constant Boltzmann

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