Answer :
Final answer:
Nuclear chain reactions in reactors involve controlled splitting of uranium nuclei to generate energy through neutron-induced fission.
Explanation:
Nuclear Chain Reaction in a Reactor
A nuclear chain reaction in a reactor involves the continuous splitting of uranium-235 nuclei, releasing energy and neutrons. These neutrons can cause the fission of more nuclei, creating a self-sustaining reaction.
Fission Process: Uranium-235 nucleus absorbs a neutron, splits into krypton-92 and barium-141 nuclei, and releases additional neutrons.
Controlled vs. Uncontrolled: Controlled chain reactions are regulated to produce energy in nuclear power plants, whereas uncontrolled reactions can lead to explosions like in a fission bomb.
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