M3_00 - ASTRONOMY 100 Dr. Werner Dppen MIDTERM 3 _ 12 pm,...

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1 ASTRONOMY 100 Dr. Werner Däppen MIDTERM 3 __________ 12 pm, 14 November 2000 Exam Number Name (Please Print) 1. Sunspots are, compared to the surrounding regions on the Sun, ______________. a) hotter and brighter areas b) cooler and brighter areas c) hotter and darker areas d) cooler and darker areas 2. A typical white dwarf has the size of _________ . a) the Sun b) the Earth c) a big city on Earth d) a fairy-tale dwarf e) gnome of Zurich 3. The parallaxes of the nearest known stars are a bit less than _____ second(s) of arc. a) 1,000 b) 100 c) 10 d) 1 e) 0.1 4. Which of the following stars lie on the main sequence? a) Blue giants b) Red giants c) White dwarfs d) Neutron stars e) none of the above
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2 5. Spectacular comets are very rare events. Which of the following reasons is wrong ? a) Comets have very eccentric orbits. b) Comets only develop brightness and a tail when they are close to the Sun. c) Comets have periods ranging from typically one hundred to about a million years. d) There are often comets near the Earth or the Sun (every month or so), but they have only very small cores (with diameters of a few km), and most are therefore invisible even if they are close to Earth. 6. The mnemonic ``O be a fine girl (or guy), kiss me" is there to memorize ________. a) stellar parallaxes b) spectral types of stars c) distance, distance, distance d) the names of moons in the solar system e) the spectral lines of the hydrogen atom 7. The hot gas of the deep solar interior would want to expand were it not for ________. a) the solar wind blowing against it b) the corona standing in the way c) sunspots stopping the gas d) gravity e) empty space 8. In a binary system, which characteristic quantity of the stars can be directly inferred by knowing the orbital period of the stars and the distance between them? a) Absolute brightness of the stars. b) Diameter of the stars. c) Surface temperature of the stars. d) Mass of the stars. 9. A typical star spends most of its lifetime _____________. a) before the onset of hydrogen fusion. b) during the final explosion event(s). c) as a red giant or supergiant. d) as a main sequence star.
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3 10. Which of the following planets has the largest moon measured relative to the planet's own mass and size. a) Jupiter b) Saturn c) Mercury d) Neptune e) Pluto To answer the next four questions , select the best answer from the following choices. (Here, a given answer might appear more than once, but then it might not.) a) optical binary b) visual binary c) spectroscopic binary d) eclipsing binary 11. ________:Two stars which over the years are observed to be revolving around their common center of mass. 12.
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This note was uploaded on 06/26/2009 for the course ASTR 100Lxg taught by Professor Dappen during the Fall '07 term at USC.

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M3_00 - ASTRONOMY 100 Dr. Werner Dppen MIDTERM 3 _ 12 pm,...

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