AP Physics 2easymcq1 pt
A radioactive sample has a half-life of 10 hours. How much of the sample will remain after 30 hours?
A.25%
B.12.5%
C.6.25%
D.3.125%
Explanation
Core Concept
After each half-life (10 hours), half of the sample remains. After 30 hours, there have been 3 half-lives. The remaining fraction is (1/2)^3 = 1/8 = 12.5%.
Correct Answer
B12.5%
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