What is nuclear energy ?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Nuclear Energy**: Nuclear energy is the energy that is released from the nucleus of an atom during nuclear reactions. These reactions can be either nuclear fission or nuclear fusion.

2. **Nuclear Fission**: In nuclear fission, the nucleus of a heavy atom (like uranium or plutonium) splits into two or more smaller nuclei, along with the release of a significant amount of energy. This process is commonly used in nuclear power plants to generate electricity.

3. **Nuclear Fusion**: In nuclear fusion, two light atomic nuclei combine to form a heavier nucleus. This process also releases a large amount of energy and is the same reaction that powers the sun and other stars.

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