day_07 - September 15, 2010 Exams returned, answers posted...

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September 15, 2010 Exams returned, answers posted on web page, grade histogram. Reading, Sections 6.4, 6.5. Sections 1.2, 2.1, 2.4, 2.5 for background. Next week, Section 6.6, Chapter 7. Astronomy in the News? Pic of the Day – what phase was the Moon in last night?
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Goal To understand how the collapse of an iron core can trigger a supernova explosion
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One minute exam Why do you have to heat a nuclear fuel to make it burn? Charge repulsion keeps nuclei apart The strong nuclear force keeps nuclei apart To overcome the loss of neutrinos To make neutrons
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One minute exam What is the importance of iron in massive stars? It produces a great deal of energy It absorbs energy It produces neutrinos It combines with oxygen and produces rust
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Iron core of massive star absorbs energy, collapses in about 1 second to form a neutron star . Essentially all protons and electrons are converted to neutrons with the emission of a neutrino , tiny mass, no electrical charge, interacts little with normal matter, only through weak nuclear force (Chapter 1.2)
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This note was uploaded on 10/23/2010 for the course AST 47700 taught by Professor Wheeler during the Fall '10 term at University of Texas at Austin.

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day_07 - September 15, 2010 Exams returned, answers posted...

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