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University Physics, Volume 3 | 17th Edition | ISBN: 9781938168185 | Authors: Samuel J. Ling ISBN: 9781938168185 2032

Solution for problem 65 Chapter 11

University Physics, Volume 3 | 17th Edition

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University Physics, Volume 3 | 17th Edition | ISBN: 9781938168185 | Authors: Samuel J. Ling

University Physics, Volume 3 | 17th Edition

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Problem 65

The Big Bang

Our solar system orbits the center of the Milky Way Galaxy. Assuming a circular orbit 30,000 ly in radius and an orbital speed of 250 km/s, how many years does it take for one revolution? Note that this is approximate, assuming constant speed and circular orbit, but it is representative of the time for our system and local stars to make one revolution around the galaxy.

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Supernovae and their Remnants July 4, 1054 event  Chinese, Japanese maybe even Anasazi record a new star in Taurus  Peak apparent magnitude = -5 Supernova Light Curves  Two classes  Type 1: Bright at its peak. Bright, fast decaying  Type 2: Doesn’t get as bright at its maximum much long, but lasts longer. Dimmer, slower decaying Type II SN – observations  High mass stars  Not as bright, slower dimming  Find compact object in center:  Neutron Stars  Black Holes The Problem w/ Iron!  Hydrogen, Helium, Carbon, Oxygen = Fusion releases energy  Uranium, Lead = Fission releases energy  Iron cannot fuse because it cannot make matter from energy  Iron cannot fission  Iron will collapse under gravity  Iron core mass > 1.44 M Sun  Electrons & Protons are smashed into Neutrons and then they burst into Neutrinos Type II SN – theory  Fusing shells, Iron core  Collapsing core  P + e  N  Gamma rays and neutrinos are emitted  Implosion sends out a shock wave when neutron core recoils  Neutron star or black hole is left  Star explodes because the dense matter transfers its momentum to light particles SN 1987A  First SN in 1987  Supernova (SN) in Large Magellanic Cloud  Closest one in modern times  Neutrinos detected confirm theory Supernova Light Curves  Brightness vs. Time  Powered by Radioactive decay: 56 56 56  Ni  Co  Fe  Evidence in the light curve shape Nucleosynthesis (all elements > Zn)  Neutron Capture – free neutrons are capture by a heavy nucleus  “Slow” or

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Chapter 11, Problem 65 is Solved
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Textbook: University Physics, Volume 3
Edition: 17
Author: Samuel J. Ling
ISBN: 9781938168185

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