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What is meant by chain reaction ?...

What is meant by chain reaction ?

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A heavy nucleus undergoing fission splits into two smaller nuclei and 2 or 3 neutrons with the release of energy. The neutrons released in the fission can go on to produce fission in three other Uranium-235 nuclei. These Uranium nuclei split to produce further neutrons which in turn trigger fission in further Uranium-235 nuclei and so on. This is referred to as a chain reaction.
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