The half-life of a radioisotope is four hours. If the initial mass of the isotope was 200 g , the undecayed mass remaining after 24 hours is :

Options

A. `1.042 g`
B. `2.084 g`
C. `3. 125 g`
D. `4. 167 g`

Answer

C

Explanation

`t_(1//2)=4` hours
after 24 hours i.e. after 6 half times undecayed mass `=(200)/(2^(6))=(200)/(64)=3.125g`