In an atomic bomb, energy release is due to the uncontrolled fission of plutonium 239Pu (or 235U). The bomb's rating is the magnitude of the released energy, specified in terms of the mass of TNT required to produce the same energy release. One megaton of TNT releases 2.6 x 1028 MeV of energy. (a) Calculate the rating, in kilotons of TNT, of an atomic bomb containing 97.1 kg of 239Pu, of which 2.6 kg actually undergoes fission. The energy released is 180 MeV per fission event. (b) Why is the other 94.5 kg of 239Pu needed if it does not fission? (a) Number i Units (b) v it is needed for super critical mass it is wasted