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| Q. |
Neutrons are slowed down in a nuclear reactor by – |
| A. | Fissionable Material |
| B. | Moderator |
| C. | Control rods |
| D. | Cooling system |
| Answer» B. Moderator | |
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Explanation: In thermal nuclear reactors, the coolant acts as a moderator that must slow down the neutrons before they can be efficiently absorbed by the fuel. It allows neutrons to slow down to energies where they can easily cause a nucleus to fission. |
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