ICSE Class 10 Physics 2018 Solved Paper

The ore of Uranium found in nature contains ${ }_{92} U^{238}$ and ${ }_{92} U^{235}$ . Although both the isotopes are fissionable, it is found out experimentally that one of the two isotopes is more easily fissionable.

Question : 73 of 78

Marks: +1, -0

Give a reason for your answer.

Solution:

The reason is that the fission of

{ }_{92} {\U}^{238}

nucleus is possible only by the fast neutrons, while the fission of

{ }_{92} {\U}^{235}

nucleus can be even by the slow neutrons.

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