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

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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 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 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 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:
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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?
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