1.

\[{{D}_{2}}O\] is preferred to \[{{H}_{2}}O,\]as a moderator, in nuclear reactors because

A. \[{{D}_{2}}O\] slows down fast neutrons better
B. \[{{D}_{2}}O\] has high specific heat
C. \[{{D}_{2}}O\] is cheaper
D. None of these
Answer» E.


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