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ASTR 3 Fall -2007 Nature of the Universe Midterm1 version B soln

# ASTR 3 Fall -2007 Nature of the Universe Midterm1 version B soln

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1 1 st Midterm Exam for Astro 3 (Hauser), Fall 2007 Version Solution s

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2 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Enter your answer on the Scantron sheet. 1. What phase of Venus is impossible to explain in Ptolemy’s Earth-centered model of the Solar System, where the Sun revolves around the Earth further away than Venus does? a. New. b. Full. c. Waxing crescent. d. Waning crescent. 2. Mars goes around the Sun at a distance of about 1.5 AU. It therefore will orbit the Sun about every: a. 4 years. b. 1.84 years. c. 1.5 years. d. 1 year. 3. One of Kepler’s Laws says “planets sweep out equal areas in equal time”. Another way to say essentially the same thing is: a. All planets are created equal. b. Planets are all equally good at cleaning up the Solar System. c. Planets move slower when further from the Sun. d. All planets move in elliptical orbits. 4. The force of the Sun’s gravity on planets is large because of the Sun’s: a. Large size. b. Large distance. c. Large mass. d. Large charge. 5. The planets keep moving in their orbits around the Sun because of: a. A object in motion with no force on it will continue to move in the same way. b. The force of gravity pulls them around the Sun rather than moving in a straight line away from it. c. Habit. d. (Actually, they don’t. They move around the Earth instead.) 6. Chris sits next to Silvia during every Astronomy 3 lecture. Gravitationally speaking , he feels a: a. Strong attraction to Silvia. b. Strong repulsion from Silvia. c. Weak attraction to Silvia. d. Weak repulsion from Silvia. e. No attraction or repulsion whatsoever.
3 7. Visible light covers what portion of the electromagnetic spectrum? a. A small portion. b. About half. c. Most of it. d. All of it. e. None, it is not electromagnetic. 8. In order to build an instrument to break up the different wavelengths of light and see a spectrum of light, one especially needs which of the following: a. A lens. b. A telescope. c. Heated hydrogen gas. d. A prism. e. A large research grant. 9. As wavelengths of electromagnetic radiation get longer: a. The frequency gets higher and the speed stays the same. b. The frequency gets lower and the speed stays the same. c. The frequency gets higher and the speed goes down. d. The frequency gets lower and the speed goes down. e. The frequency stays the same and the speed goes down. 10. A star that is much hotter than the Sun (say, 5 or 10 times hotter) will emit most of its electromagnetic radiation in which band? a.

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ASTR 3 Fall -2007 Nature of the Universe Midterm1 version B soln

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