Discussion
When U-235 nucleus is fissioned, energy is released in addition to the emission of fission fragments. In fission, the energy is released because :
Answer: A
The key's answer is that the binding energy of each fission fragment is greater than that of U-235, read as binding energy per nucleon.
U-235 is bound by about 7·6 MeV per nucleon, while nuclei in the mass range of the fragments, near the peak of the binding-energy curve, are bound by about 8·5 MeV per nucleon. When the nucleus splits, its nucleons become more tightly bound, and the extra binding, about 0·9 MeV for each of 235 nucleons, roughly 200 MeV, is released.
Taken as total binding energy, a single fragment has less than the whole uranium nucleus, but that comparison does not explain any release, so option B is wrong. If the sums were equal (option C) no energy would be released, and the difference of the fragments' binding energies (option D) has no physical meaning here.
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