Q.

Neutrons are slowed down in a nuclear reactor by –

A. Fissionable Material
B. Moderator
C. Control rods
D. Cooling system
Answer» B. Moderator
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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