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A moderator is used in nuclear reactor in order to ?

AAccelerate the neutrons

BSlow down the speed of the neutrons

CIncrease the number of elections

DDecrease the number of electrons

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Correct Answer: B: Slow down the speed of the neutrons

Explanation: The correct answer is B: Slow down the speed of the neutrons. A moderator is used in a nuclear reactor to slow down the speed of neutrons. Slow (thermal) neutrons are more effective at causing fission in uranium-235.

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