Question

The fission of a heavy nucleus gives, in general, two smaller nuclei, two or three neutrons, some $\beta$-particles and some $\gamma$ -radiation. It is always true that the nuclei produced

• A. have a total rest-mass that is greater than that of the original nucleus
• B. have large kinetic energeis that carry off the greater part of the energy released
• C. travel in exactly opposite directions
• D. have neutron-to-proton ratios that are too low for stability

Answer 1

The correct option is B have large kinetic energeis that carry off the greater part of the energy released

The nuclear fission differs from other nuclear reactions in three respects.
a. The nucleus is deeply divided into two large fission fragments or nuclei of roughly equal mass. The nuclei or fission fragments fly apart at great speed and thus possess large kinetic energies that carry off the greater part of the energy released.
b. The mass decrease is appreciable and hence large energy is released.
c. Other neutrons, called fission neutrons, are emitted in the process. Small amount of energy is released in the form of radiation.