A sample of `._(19)K^(40)` disintegrates into two nuclei Ca & Ar with decay constant `lambda _
Channel: Doubtnut
Date: 05/04/2020

A sample of `._(19)K^(40)` disintegrates into two nuclei Ca & Ar with decay constant `lambda _(Ca)=4.5 xx10^(-10) S^(-1)` and `lambda_(Ar)=0.5xx 10^(-10)S^(-1)` respectively. The time after which 99% of `._(19)K^(40)` gets decayed is