The radioactive decay rate of a radioactive element is found to be `10^(3) ` disintegration per second at a cartain time . If the half life of the element is one second , the dacay rate after one second ….. And after three second is ……

Options

A. `500 s^(-1)`
B. `1000 s^(-1)`
C. `250 s^(-1)`
D. `2000 s^(-1)`

Answer

a

Explanation

`(A_(2))/(A_(1))=(N_(2))/(N_(1))`
`(A_(2))/(10^(3))=(1)/(2)` or `A_(2) =(1000)/(2)=500 s^(-1)`.