Question

Define Nuclear fission.

Answer 1

Nuclear fission is the process in which a large nucleus splits into two smaller nuclei with the release of energy. In other words, fission is the process in which a nucleus is divided into two or more fragments, and neutrons and energy are released.

The mass changes and associated energy changes in nuclear reactions are significant. For example, the energy released from the nuclear reaction of $1$ kg of uranium is equivalent to the energy released during the combustion of about four billion kilograms of coal.