`4` grams of radioactive substance `A` left `1//2 gm` after some time . `1` gram of another radioactive substance `B` left `1//4 gm` in the same period, If half life of `B` is `2` hours, the half life of `A` is ( in hours)

Options

A. `3//4`
B. `4//3`
C. `1//4`
D. `1//2`

Answer

B

Explanation

`W = (W _(0))/(2 ^(n)),` no of half lives `n = (t)/(t _(1//2))`