Q. The function of heavy water in a nuclear reactor is to

A
Slow down the speed of neutrons
B
Increase the speed of neutrons
C
High probability of absorption of neutrons
D
Stop the nuclear reaction
Solution:

Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238, which captures neutrons without fissioning.

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