Atomic And Nuclear Physics - SS3 Physics Past Questions and Answers - page 3

Gamma decay occurs when the nucleus emits a gamma ray, which is a high-energy electromagnetic radiation. Gamma decay does not change the atomic number or mass number of the nucleus.

Nuclear fusion involves combining two light nuclei, such as hydrogen isotopes, to form a heavier nucleus, releasing a large amount of energy in the process. This process powers the sun and other stars and is also being researched as a potential source of clean energy.

Nuclear fission occurs when a heavy nucleus, such as uranium or plutonium, is bombarded with a neutron and splits into two smaller nuclei, releasing energy in the form of gamma rays, neutrons, and kinetic energy. This process is the basis for nuclear power plants and nuclear weapons.