In a nuclear reactor, nuclear energy is obtained by breaking the nucleus of uranium by :

fast moving neutrons

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fast moving electrons

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slow moving electrons

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slow moving neutrons

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Solution

The correct option is D slow moving neutrons
D
In fission each nucleus of uranium -235 emits on an average more than two neutrons. If one of these two neutrons is absorbed by another uranium -235 nucleus, causing it to fission, thus we can have a sustainable chain reaction. However, only a slow neutron, rather than a fast neutron has a high cross section( chance) of absorption. That is why slow moving neutrons are used.

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