A heavy nucleus break into two fragments by itself
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B
A light nucleus bombarded by thermal neutrons breaks up into smaller nuclei
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C
A heavy nucleus bombarded by thermal neutrons breaks up into smaller nuclei
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D
Two light nuclei combine to form a heavier nucleus
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Solution
The correct option is C A heavy nucleus bombarded by thermal neutrons breaks up into smaller nuclei The particles used to bombard the nuclei of atoms for causing nuclear reactions, are called projectiles. Neutrons are the best projectiles which are bombarded over an unstable nucleus of a heavy atom (like uranium) to split it into two medium weight nuclei with the liberation of a large amount of energy which is called nuclear fission reaction.