Q. The half-life of a radioactive substance is 10 days. After 30 days, the remaining fraction is:
✅ Correct Answer: (C)
1/8
Explanation: 30 days correspond to 3 half-lives. Remaining fraction = (1/2)^3 = 1/8.
Explanation by: Tina Singh
30 days correspond to 3 half-lives. Remaining fraction = (1/2)^3 = 1/8.