19. (a) From Eq. 37-50, Qmcmmmcp=−=−−−=∆Λ2201115 6938 3139 637 7()....π−MeVMeVMeVMeV.(b) We use the formula obtained in problem 44-9 (where it should be emphasized that Eis used to mean the rest energy, not the total energy): KEEEEpp−
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