Half-life of a radioactive substance A is `4 days`. The probability that a nuclear will decay in two half-lives is

Options

A. `1//4`
B. `3//4`
C. `1//2`
D. `1`

Answer

B

Explanation

After two half life `1//4^(th)` fraction of nuclei will remain undecayed. `3//4^(th)` fraction will decay.
Hence, the probability that a nucleus decays in two half lives is `3//4`.