The mean life of a radioactive sample is 100 years. Then after 100 years, about -

Options

A. `0%` of the smple remains active
B. `37%` of the smple remains active
C. `63%` of the smple remains active
D. `50%` of the sample remains active

Answer

B

Explanation

`t_("mean") = (1)/(lamda) = 100`
`rArr N =N_(0)e^(-lamda t)=N_(0)//e =37N_(0)`