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Graphite is used in nuclear reactor :...

Graphite is used in nuclear reactor :

A

for reducing the speed of neutrons

B

as a fuel

C

as a lubricant

D

for lining the inner surface of the reactor which will work as an insulator.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Role of Graphite:** - Graphite is a form of carbon that has a layered structure, allowing it to conduct electricity and heat. In nuclear reactors, it serves a specific function. 2. **Identifying the Function of Graphite in Nuclear Reactors:** - In a nuclear reactor, a nuclear fission reaction occurs, where heavy atomic nuclei split into smaller nuclei, releasing energy and neutrons. The speed of these neutrons is crucial for maintaining a controlled reaction. 3. **Graphite as a Moderator:** - Graphite is used as a moderator in nuclear reactors. A moderator is a substance that slows down fast neutrons produced during fission. By slowing down the neutrons, graphite increases the likelihood of these neutrons being captured by fissile material (like Uranium-235), which leads to further fission reactions. 4. **Conclusion:** - Therefore, the primary reason graphite is used in nuclear reactors is to reduce the speed of neutrons, making it easier for the neutrons to sustain the nuclear chain reaction. 5. **Evaluating Other Options:** - The other options provided (as a fuel, lubricant, or insulator) are incorrect. Graphite does not serve as a fuel in this context, nor does it function as a lubricant or insulator in the reactor. **Final Answer:** - Graphite is used in nuclear reactors primarily for reducing the speed of neutrons. ---
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