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Question

# half life of a radioactive substance A is 4 days. the probability that a nucleus will decay in two half lives is:1/4e2−1e23/42/5

A
3/4
B
2/5
C
1/4
D
e21e2
Solution
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#### The correct option is C 3/4Aftertwohalflives1th4fractionofnucleiwillremainundecayedor,3th4fractionwilldecayhencetheprobabilitythatanucleusdecaysintwohalflivesis34Hence,option (C) is correct answer.

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