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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 : (a)1/2(b)1/4(c)3/2(d)3/4

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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 : (a)1/2(b)1/4(c)3/2(d)3/4
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Answer : (d) 3/4 

Explanation: After two half-lives 1/4th fraction of nuclei will remain undecayed . or 3/4th fraction will decay hence the probability that a nucleus decays in two half-lives is 3/4

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