First slide

Water and Heavy water

Question

$D_{2} O$ is preferred to $H_{2} O$ , as a moderator, in nuclear reactors because

Moderate

A

$D_{2} O$ slows down fast neutrons better
B

$D_{2} O$ has high specific heat
C

$D_{2} O$ is cheaper
D

None of these

Solution

$D_{2} O$ absorbs neutrons more than $H_{2} O$ and this decreases the number of neurons for the fission process.

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