Fast neutrons can be easily slowed down by:

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(B) Fast neutrons are slowed down by a process called moderation. When fast neutrons collide with light nuclei like hydrogen (present in water or heav

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Passing them through heavy water

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(B) Fast neutrons are slowed down by a process called moderation. When fast neutrons collide with light nuclei like hydrogen (present in water or heavy water),they lose a significant amount of kinetic energy in each collision due to the comparable mass of the neutron and the proton. Therefore,passing them through heavy water or ordinary water is an effective way to slow them down.

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