A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?
-
(15)/16
- (1)/16
- (3)/4
- (1)/4
The correct answer is: A
Explanation
16 days = 4 half-lives.
The fraction left 16 days = after 4 half live, = (1/2)4 = (1)/16
Fraction that decayed = 1- \(\frac{1}{16}\)
\(\frac{15}{16}\)