A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?
-
A.
(15)/16 -
B.
(1)/16 -
C.
(3)/4 -
D.
(1)/4
Correct Answer: Option A
Explanation
16 days = 4 half lives.
The fraction left 16 days = after 4 half live, = (1/2)4 = (1)/16.
∴ fraction delayed = (15)/16