1.

The decay constant of a radioactive element is `3 xx 10^(-6) "min"^(-1)`. Its half-life isA. `2.31 xx 10^(5)` minB. `2.31 xx 10^(6)` minC. `2.31 xx 10^(-6)` minD. `2.31 xx 10^(-7)` min

Answer» Correct Answer - A
`t_(1//2) = (0.693)/(lamda) = (0.693)/(3 xx 10^(-6) "min"^(-1)) = 2.31 xx 10^(5)` min


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