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Indicate in symbols any three isotopes of uranium. Which among these is used for nuclear fission? What is meant by criticality of a nuclear reaction?

(i) Isotopes of Uranium: ₉₂U²³⁵; ₉₂U²³⁷; ₉₂U²³⁸.

(ii) ₉₂U²³⁵ is used tor nuclear reaction.

(iii) Criticality of a nuclear reaction implies fission process is so controlled that a manageable constant power output is obtained.

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Indicate in symbols any three isotopes of uranium. Which among these is used for nuclear fission? What is meant by criticality of a nuclear reaction?