AP Physics 2mediummcq1 pt
A 100 g radioactive sample has a half-life of 10 days. After 20 days, the remaining mass is
A.25 g
B.50 g
C.0 g
D.12.5 g
Explanation
Core Concept
Two half-lives leave 100 → 50 → 25 g.
Correct Answer
A25 g
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