If a substance with hlaf life `3` days is taken at other place in `12` days. What amount of substance is laft now ?

Options

A. `1//4`
B. `1//8`
C. `1//16`
D. `1//32`

Answer

C

Explanation

T=12 days , `t_(1//2)=3` days
n(Number of half lives )`=(12)/(3)=4`
Amount of substance left`=(N_(0))/(2^(n))=(N_(0))/(24)=(N_(0))/(16)` or 1/16 of the original amount.