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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 answer: to slow down the neutrons to thermal energies

Solution

The moderator in a nuclear reactor, such as heavy water, is used to slow down fast-moving neutrons to thermal energies, making them more likely to cause fission in the nuclear fuel.

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