The half-life of radon is 3.8 days. How much of a 100 g sample remains after 11.4 days?
Q1. The half-life of radon is 3.8 days. How much of a 100 g sample remains after 11.4 days?
Answer: 12.5 g
Explanation: After 11.4 days (3 half-lives), 100 g -> 50 g -> 25 g -> 12.5 g remains. Other options are after fewer half-lives.