L8 - 10/22/09 The Sun Size (diameter) ~100x Earths diameter...

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10/22/09 The Sun Size (diameter) – ~100x Earth’s diameter (10x Jupiter) Mass – ~300,000x Earth’s mass (1,000x Jupiter) Composition: 78% H 20% He 2% Other Interior of Sun: 1) Core – innermost layer, where nuclear fusion occurs ~15 million degrees (K) Extremely high pressure/density Matter exists in plasma state (charged particles) Energy produced by nuclear fusion 4p + 1 He + Energy (released as gamma rays) Energy produced by converting Hydrogen and Helium energy released by gamma rays **NUCLEAR REACTIONS** Fission – 1 large nucleus 2 smaller ones + energy Fusion – 4p + 4 He 2+ + 2e + (positron) + 2v (neutrino) + Energy (2 Gamma Rays) 2) Radiative Zone Makes up 85% of sun (technically includes core) Temperature: ~10 million K Energy transferred by means of radiation (photons) As gamma rays bounce off, plasma energy is lowered Fewer high-E gamma rays converted to more lower-E X-rays 3) Convective Zone
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This note was uploaded on 02/17/2010 for the course PHY 115 taught by Professor Weinbeck during the Spring '09 term at BC.

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L8 - 10/22/09 The Sun Size (diameter) ~100x Earths diameter...

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