Nuclear Physics
UPPCS
The half-life of a radioactive element is 5 years, then the fraction of the radioactive substance that remains after 20 years is
(A) 1/2
(B) 1/4
(C) 1/8
(D) 1/16
Important Facts
- In 20 years, there are 4 half-lives (20/5). Remaining fraction = (1/2)⁴ = 1/16.
No comments yet.