How energy released in nuclear energy?

Answer 1

When there is nuclear fusion (when atoms push together and make energy) and nuclear fission (when atoms split apart to make energy).

Answer 2

In nuclear energy, energy is released through a process called nuclear fission or fusion. In nuclear fission, heavy atoms like uranium split into smaller ones, releasing a large amount of energy in the form of heat and radiation. In nuclear fusion, lighter atoms combine to form heavier ones, also releasing a significant amount of energy.