The half-life period of a radioactive element is 140 days. After 560 days, one gram of the element will reduce

Options

A. (1/2) g
B. (1/4) g
C. (1/8)g
D. (1/6)g

Explanation

A radioactive decay follows first-order kinetics . 560 Days are equivalent to four half-lives. Hence, the mass of radioactive element left is `(1//2^(4))` g, i.e., (1/16)g