The decay constant of a radioactive samp...

The decay constant of a radioactive sample is `lambda`. The half-life and the average-life of the sample are respectively

A

`1//lambda and (ln 2)//lambda`

B

`(ln2)lambda and 1//lambda`

C

`lambda (ln 2) and 1//lambda`

D

`lambda//(ln 2) and 1//lambda`

Verified by Experts

The correct Answer is:

b

From `R=R_(0)((1)/(2))^(n)`, we have
`1=64((1)/(2))^(n)`
or `n=6` =numbers of half-lives
`t=n xx t_(1//2)=6xx2 =12h`

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