p43_055 - m is the mass of an electron. Once cancellations...

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55. Let M Cs be the mass of one atom of 137 55 Cs and M Ba be the mass of one atom of 137 56 Ba. To obtain the nuclear masses, we must subtract the mass of 55 electrons from M Cs and the mass of 56 electrons from M Ba . The energy released is Q =[ ( M Cs 55 m ) ( M Ba 56 m ) m ] c 2
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Unformatted text preview: m is the mass of an electron. Once cancellations have been made, Q = ( M Cs M Ba ) c 2 is obtained. Therefore, Q = [136 . 9071 u 136 . 9058 u] c 2 = (0 . 0013 u) c 2 = (0 . 0013 u)(931 . 5 MeV / u) = 1 . 21 MeV ....
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