What is the role of graphite in nuclear reactor?

Explanation

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

1. **Understanding Nuclear Reactions:**
- In a nuclear reactor, nuclear fission occurs, which involves the splitting of heavy atomic nuclei, commonly uranium or thorium. This process releases a significant amount of energy and produces neutrons.

2. **Role of Neutrons:**
- The neutrons produced during fission are very fast-moving. For the fission process to continue efficiently, these neutrons need to be slowed down.

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