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  1. Effective moderators are those materials which contain

    2. A.

     Light weight atoms
    B.

     Heavy weight atoms
    C.

     Critical atoms
    D.

     Zero weight atoms

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    Answer : Option A

    Explanation :

    Moderators are made from materials with light nuclei which do not absorb the neutrons but rather slow them down by a series of collisions.
    Carbon in the form of graphite is a material used for moderators as is heavy water which is Deuterium an isotope of Hydrogen with an atomic mass of 2 bonded to Oxygen.

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