Question

Two radioactive substance `X` and `Y` initially contain equal number of nuclei. `X` has a half life of `1` hour and `X` has a half-life of `2` hours. After the ratio of activity of `X` to that of `y` is
A. `1:4`
B. `1:2`
C. `1:1`
D. `2:1`

Answer 1

Correct Answer - B
`(A_(x))/(A_(y)) = (A_(0)((1)/(2))^(2//1))/(A_(0)((1)/(2))^(2//2)) = (1)/(2)`
`{:(N_(0),0,t =0):}`