What is nuclear fission?​

The process of breaking down of heavy nucleus into lighter ones is called nuclear fission.Similarly,the proces of combining lighter nucleus to heavy nucleus is also called nuclear fission.

a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.

Explanation:

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pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y