Multiple choice

A moderator is used in nuclear reactors to

  1. slow down the speed of neutrons

  2. increase the number of neutrons

  3. decrease the number of neutrons

  4. none of these
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A Correct answer
Explanation

A moderator slows down fast neutrons produced during fission to thermal energies, making them more likely to cause further fission reactions. Common moderators include water, heavy water, and graphite.

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