Define Nuclear Chain Reaction.
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Nuclear chain reaction occurs when one single nuclear reaction causes an average of one or more subsequent nuclear reactions , thus leading to the possibility of a self - propagating series of these reaction. The specific nuclear reaction maybe the fission of heavy isotopes( eg. uranium - 235 ). The nuclear chain reaction releases several million times more energy per reaction than any chemical reaction
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Nuclear chain reactions are series of nuclear fissions (splitting of atomic nuclei), each initiated by a neutron produced in a preceding fission. For example, 2½ neutrons on the average are released by the fission of each uranium-235 nucleus that absorbs a low-energy neutron.
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