midterm3S09 - Dr. Nick Warner 5:00 pm, April 14th, 2009...

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1 ASTRONOMY 100 Dr. Nick Warner MIDTERM 3 ____________ 5:00 pm, April 14 th , 2009 SOLUTIONS AT THE END Exam Number Time Allowed: 1 hour _________________________ Name (Please Print) 1. Neutron stars were first discovered by a) neutrino emission from supernovae b) visible flashes of light inside a supernova remnant c) radio signals from pulsars d) their X-ray emission e) their highly red-shifted emission spectra 2. A protostar obtains the energy it radiates from a) hydrogen fusion b) helium fusion c) chemical reactions d) fission of heavy elements e) gravitational collapse 3. It would be very unlikely that a large satellite could orbit around Saturn in the middle of Saturn's rings because such a large satellite would a) be fragmented by impacts by ring particles b) be fragmented by impacts by other large satellites c) spiral into Saturn by gas drag of Saturn's atmosphere d) be torn apart by tides from Saturn's gravity e) be torn apart by Saturn's magnetic field 4. There is a mass limit for a star in the white dwarf phase, the Chandrasakhar limit, beyond which the star can no longer support itself against its own weight. This mass limit, in terms of solar mass, is a) 1.4 b) 14 c) 0.2 d) 30 e) 3 5. A metal that is relatively abundant in meteorites but generally rare on Earth has been found in specific layers of clay throughout the world, and its study is helping to evaluate the effect of meteor impacts on Earth's climate and its inhabitants in recent geological time (e.g., dinosaurs). This metal is a) nickel b) uranium c) iron d) iridium e) gold 6. Who was it that first discovered that mass and energy were equivalent and that one could be converted into the other? a) Fermi. b) Einstein. c) Chandrasekhar. d) Kelvin. e) Helmholtz. 7. Which of the following is not true about supernova explosions: a) they can cause star formation to begin in neighboring nebulae b) such an explosion was probably the source of most of the heavy elements in our solar system c) they can be seen at very great distances, and in particular, in other galaxies d) such an explosion will often leave a neutron star as a remnant e) none of the above - they are all true of a supernova explosion
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2 8. A meteor shower, the appearance of greater than average numbers of “shooting stars” at a particular time in the year from a specific direction in the sky, is related to which astronomical phenomenon? a) The passage of Earth through intense streams of solar material, including dust particles, during regular solar activity b) Material re-entering Earth's atmosphere after being ejected into space by violent volcanic eruptions on Earth c) The passage of Earth through the remnants of an old comet d) A small piece of rock or asteroid fragmenting as it passes through Earth's atmosphere e) Earth's passage through part of the asteroid belt 9. The Trojan asteroids orbit the Sun in circular orbits at the same distance as a) the main asteroid belt b) Jupiter c) Mars d) Neptune e) Earth 10. In the distant future, when our Sun no longer has any nuclear reactions, its center will be made primarily
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This note was uploaded on 09/20/2009 for the course ASTR 50810 taught by Professor Rhodesjr during the Spring '08 term at USC.

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midterm3S09 - Dr. Nick Warner 5:00 pm, April 14th, 2009...

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