Question

what is nuclear fission and nuclear fusion?name one moderator used in nuclear reaction

Answer 1

Nuclear fission

Definition

Nuclear fission is the process in which a heavy metal is splitted to form two two light nuclei nearly similar in size by bombarding it with slow neutrons thereby releasing a large amount of energy in the form of heat and light.

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Example

$295_{92}U+^1_{0}n\implies 144_{56}Ba+89_{36}Kr+3\:^1_{0}n+\bf{energy}$

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Nuclear fusion

Definition

Nuclear fusion is the process in which two light nuclei combine to form a nucleus thereby releasing large amount of energy.

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Example

$^1_{1}H+^1_{1}H\implies ^2_{1}H+\bf{energy}$

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Moderator

The moderator that can be used is graphite !

• It helps to control the nuclear fission chain reaction
• Hence this can be used for constructive purposes .

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Hope it helps you

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