If half-life of a substance is `3.8` days and its quantity is `10.38 gm`. Then substance quantity remaining left after `19` days will be

Options

A. 0.151 g
B. 0.32 g
C. 1.51 g
D. 0.16 g

Answer

B

Explanation

No. of half life `=(19)/(3.8)= 5`
`(N)/(N_(0)) = ((1)/(2))^(n) = ((1)/(2))^(5) rArr N= (10.38)/(32) = 0.32g`