finalA - Astronomy 10 - Fall 2008 Final Exam December 16,...

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Unformatted text preview: Astronomy 10 - Fall 2008 Final Exam December 16, 2008 This test has 60 multiple-choice questions. You need Scantron form 882-E to take it. You are allowed to use a calculator and one page (double-sided) of written notes. All other materials and references should be put away. Note the list of equations and physical quantities attached to the back of this test. Be sure to write your full name , SID , and section number on your Scantron form. 1. THIS EXAM IS VERSION A. PLEASE ANSWER A TO QUESTION 1. 2. By mass, the chemical composition of the Sun is (a) 70 percent hydrogen, 2 percent helium, 28 percent heavier elements (b) 70 percent hydrogen, 28 percent helium, 2 percent heavier elements (c) 90 percent nitrogen, 10 percent methane (d) 78 percent nitrogen, 21 percent oxygen, 1 percent argon 3. The centers of galaxy clusters often contain giant elliptical galaxies. What is a plausible expla- nation of this fact? (a) Galaxies near the clusters center frequently merge, forming a giant elliptical. (b) The expansion of the universe forces all the less massive galaxies away from the cluster center. (c) This observation is only an effect of our viewing angle. From a different perspective, spiral galaxies lie at the center. (d) The central galaxies start out as irregulars, but are deformed by tidal gravity into ellipti- cals. 1 4. When our Sun leaves the main sequence, through which of the following evolutionary phases will it pass? (a) It will undergo a nova explosion, leaving behind a remanant white dwarf. (b) After helium fusion, it will collapse to a black hole. (c) It will become a planetary nebula, which will dissipate to reveal a white dwarf. (d) It will undergo a supernova and leave behind a black hole remnant. 5. The Local Group refers to (a) all the objects in the inner Solar System. (b) the nearest few dozen galaxies. (c) the galactic supercluster of which the Milky Way is a member. (d) the star cluster from which the Sun formed. 6. On what day does the Sun appear to set farthest southward on the horizon, to observers in the Northern hemisphere? (a) vernal equinox (around March 22) (b) summer solstice (around June 22) (c) autumnal equinox (around September 22) (d) winter solstice (around December 22) 7. Which of the following statements concerning the cosmic microwave background radiation is true? (a) Its intensity has increased with time. (b) It represents radiation from the first generation of stars, formed billions of years ago. (c) It looks very nearly the same in all directions in the sky. (d) It is the average spectrum resulting from the light of many galaxies combined. 2 8. Planetary nebulae are (a) the high-speed ejecta from supernova explosions....
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finalA - Astronomy 10 - Fall 2008 Final Exam December 16,...

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