question_answer

In an atom bomb, the energy is released because of the :

A)  chain reaction of neutrons and \[_{92}{{U}^{238}}\]

B)  chain reaction of neutrons and \[_{92}{{U}^{235}}\]

C)  chain reaction of neutrons and \[_{92}{{U}^{236}}\]

D)  chain reaction of neutrons and \[_{92}{{U}^{240}}\]

Correct Answer: B

Solution :

                When uranium -235 is bombarded by neutrons, each uranium nucleus is broken into two nearly equal fragments and along with it huge energy and two or three fresh neutrons are liberated. Under favourable conditions. These neutrons fission other uranium nuclei in the same way. Thus, a chain of nuclear fissions is established which continues until the whole of the uranium is consumed.