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  4. Assertion: Heavy water is a better moderator than normal water. Reason: Heavy water absorbs neutrons more efficiently than normal water.

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Q. Assertion : Heavy water is a better moderator than normal water.
Reason : Heavy water absorbs neutrons more efficiently than normal water.

AIIMSAIIMS 2019Nuclei

Solution:

The assertion is true because heavy water is a better moderator than ordinary water. This is because heavy water absorbs fewer neutrons than normal water.