If three samples have the half-lives listed below, which sample would remain radioactive the longest?

A. a sample with a half-life of 20 million years
B. a sample with a half-life of 20 hours
C. a sample with a half-life of 20 minutes
D. a sample with a half-life of 20 years
E. none of the above


Answer: A

Environmental & Atmospheric Sciences

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