Heavy water is used as a moderator in a nuclear reactor.

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Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is

1. to control energy released in the reactor
2. to absorb neutrons and stop chain reaction
3. to cool the reactor
4. to slow down the neutrons to thermal energies.

Correct Option: D

Moderator slows down the neutrons to thermal energies.