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In the 1930s nuclear energy became a serious possibility 1932 - Discovery of the neutron No change ergo can probe nucleus Hahn and Strassmann fired neutrons at U nucleus Lise Meitner and Otto Frisch interpreted this Neutrons caused splitting of U into smaller nuclei Fission had occurred Potent source of energy Energy from Emc2 In more complete form Einstein showed that at relativistic speeds we cannot use k05mv2 Remember from special relativity that as speed increases mass increases ie Work is done on a body K increases Or Work is done on a body mass increases Then ENERGY transforms into Mass Einstein Instead of k05mv2 We must use Km-m0c2 Or K mc2-m0c2 As K E-m0c2 Em0c2K Where E total energy What does Emc2 mean It means that mass is a form of energy In principle we could transform mass into other forms of energy Eg Convert 1 kg of mass into heat E130x 1082 90x1016 J Consider a fission reaction 10n 23592U 14038Xc 9438Sr 210n The mass of products is less than the mass of the reactants ie 23592U 2350439 u 14038Xc 1399054 u n 1008 u 9438Sr 939063 u 210n 2016 u 2360519 u 2358277 u Difference 02242u or about 00095 The difference is small but the c2 term means the energy will be large This introduces an idea called BINDING ENERGY which we will
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