Concepts Of Physics MCQ Edition [Volume 2]PhysicsThe Nucleus

In a nuclear fission reaction,

Options

Atwo light nuclei merge to form a heavier nucleus and possibly other products
Ba heavy nucleus divides into two fragments by itself
Ca light nucleus breaks apart when bombarded by thermal neutrons
Da heavy nucleus breaks apart when bombarded by thermal neutrons

Correct answer

D. a heavy nucleus breaks apart when bombarded by thermal neutrons

Step-by-step solution

Nuclear fission is a process in which a heavy nucleus (such as ²³⁵ U ) splits into two lighter nuclei of comparable masses when bombarded by a low-energy thermal neutron. The merging of two light nuclei is called nuclear fusion. Therefore, in a nuclear fission reaction, a heavy nucleus breaks apart when bombarded by thermal neutrons.

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