Question

------is used as a moderator for reducing the speed of neutrons. *​

Answer 1

${\small{\bold{\purple{\underline{Answer}}}}}$

Hydrogen works well as a neutron moderator because its mass is almost identical to that of a neutron. This means that one collision will significantly reduce the speed of the neutron because of the laws of conservation of energy and momentum. ... Thus light water can only be used as a moderator along with enriched fuels.

Answer 2

Answer:

Hydrogen is the answer