← Physics (4PH1)
Q1 / 5
Fission and fusion
Foundation
2 marks
In a nuclear reactor, what is the role of the moderator?
A
Slows fast neutrons so they can cause further fission in uranium-235
B
Absorbs neutrons completely to stop the reaction
C
Increases the speed of neutrons to trigger fusion
D
Cools the reactor core to prevent overheating
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