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half life of a radioactive substance A is 4 days. the probability that a nucleus will decay in two half lives is:

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Solution

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Aftertwohalflives1th4fractionofnucleiwillremainundecayedor,3th4fractionwilldecayhencetheprobabilitythatanucleusdecaysintwohalflivesis34

Hence,

option (C) is correct answer.

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