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In the nuclear reactors, moderators are ...

In the nuclear reactors, moderators are used to

A

Slow down the neutrons

B

Generate neutrons

C

Accelerate neutrons

D

Absorb the neutrons

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • In a nuclear reactor.

    A
    the chain reaction is kept under control by rods of cadmium, which reduces the rate
    B
    the thick concrete shield is used to slow down the speed of fast neutrons
    C
    heavy water (or graphite )moderate the activity of the reactor
    D
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    A
    cadmium rods are used to slow down the neutrons
    B
    moderator is used to slow down the neutrons
    C
    coolant is used to slow down the neutrons
    D
    moderator is used to control the neutrons

  • In a nuclear reactor, moderators slow down the neutrons which come out in a fission process. The moderator used have light nuclei. Heavy nuclei will not serve the purpose because

    A
    they will break up.
    B
    elastic collision of neutrons with heavy nuclei will not slow them down.
    C
    the net weight of reactor would be unbearably high.
    D
    substances with heavy nuclei do not occur in liquid or gaseous state at room temperature.

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