Problems are listed in approximate order of difficulty. A single dot (•) indicates straightforward problems involving just one main concept and sometimes requiring no more than substitution of numbers in the appropriate formula. Two dots (••) identify problems that are slightly more challenging and usually involve more than one concept. Three dots (•••) indicate problems that are distinctly more challenging, either because they are intrinsically difficult or involve lengthy calculations. Needless to say, these distinctions are hard to draw and are only approximate.
• One can get a rough estimate of the energy released in fission by considering Fig. 17.14, which shows the potential energy of the two fragments. The energy released is roughly the potential energy at x = x0, which, in turn, is roughly kq1q2/x0. (Both of these approximations will actually be overestimates.) Taking x0 ~ 12 fm, estimate the energy released in the fission 236U → 92Kr + 144Ba.
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