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Question

Which of the following nucleus is fissionable by slow neutrons:

A
92U238
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B
93Np239
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C
92U235
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D
2He4
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Solution

The correct option is C 92U235
92U235 when bombarded with a neutron form 92U236 which spontaneously decays into Ba and Kr. It is known experimentally that this reaction is effective only with slow neutrons as fast neutrons tend to evade the nuclei.
1123068_823517_ans_18955c15151d4635919ba1181f739499.jpg

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