The half-life period of a radioactive element is 140 days. After 560 days, 1 g of the element will reduce to

Options

A. 0.5 g
B. 0.25 g
C. 0.125 g
D. 0.0625 g

Answer

D

Explanation

`N = N_(0) ((1)/(2))^(a)`. Now, 560 days is equal to 4 half-life times.
for `n = 4, N = (N_(0))/(16) rArr N =(1)/(16) =0.0625` g