PHYS 190 Lecture Notes - Lecture 13: Positron, Hydrostatic Equilibrium
2 Mar 2018
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Phys 190 - lecture 13 - structure & formation of stars. Internal heat source generates gas temperature & pressure. At greater depths, greater weight lies above, hence pressure must go up. Themonuclear fusion in star"s core - energy source. Sun produces about 10,000 years of global electricity generation every second. Or, output equivalent to about one billion 100-megaton fusion bombs going off every second. Fusion & fission are due to nuclear physics, involves nucleus, not electrons. Typical size of electron orbital - 10-15m. Fusion - fusing together 2 or more light elements. Fission - suggests breakup (heavy elements breaking up) 2 protons fuse & turn into energy & other things. Competition b/w 2 forces: electrical & nuclear. Strong nuclear force - by far the most powerful force but can only act when nuclei are very close. At small speeds, electrical repulsion is too great.
