A radioactive sample contains two elements P and Q . The mass of each is `10^(-3) kg `. The ratio of their atomic weights is 1:3 Their half lives are 4s and 8s respectively . The mass of P and A after 16 s will respectively be-

Options

A. `1.25 xx 10^(5) kg ` and ` 2.5 xx 10^(-4) kg`
B. `6.25 xx 10^(-5) ` and `2.5 xx 10^(-4) kg`
C. `6.25 xx 10^(-5) kg ` and `1.25 xx 10^(-4) kg`
D. `2.25 xx 10^(-5) kg ` and `6.25 xx 10^(-4) k`

Answer

B