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Uranium 235 mass should be greater than X, then it is capable of continuous fission by itself. Identify X.

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Uranium 235 mass should be greater than X, then it is capable of continuous fission by itself. Identify X.

(a) Critical size

(b) Threshold point

(c) Critical shape

(d) Specific size

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I would like to ask this question from Nuclear Force topic in section Nucleus of Physics – Class 12

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Correct choice is (a) Critical size

Explanation: If more than one of the neutrons produced in the fission of uranium 235 is capable of inducing a fission reaction, then the number of fissions taking place at successive stages goes increasing at a very brisk rate and this generates a series of fission reactions. This is known as a chain reaction. If the mass of the Uranium235 sample is greater than a certain size called the critical size then it is capable of continuous fission by itself. So, X is critical size.

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