Question

fill in the blanks,
-------- is used as moderator in nuclear reactor for reducing the speed of the neutrons​

Answer 1

Answer:

Light water

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. In addition, light water is abundant and fairly inexpensive.

Explanation:

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Answer 2

$\sf\huge\underline{Answer :-}$

Heavy water is used as moderator in nuclear reactor for reducing the speed of the neutrons.

$\sf\huge\underline{Extra \: information :-}$

• A substance which slows down the speed of neurons in a nuclear reactor is called as a moderator.
• Graphite is also used a moderator.
• Nuclear reactor is a kind of furnace in which controlled chain reaction takes place to release manageable amount of nuclear energy which is used to produce electricity in nuclear power plant.
• The chain reaction is controlled by absorbing neutrons in such a way that only one neutron per fission is permitted to cause another fission.
• The other essential parts of a nuclear reactor is a core and control rods.
• Core is made of fissionable material such as U235.
• Control rods absorb neutrons. They are usually made of boron.