Let T be the half-life of a certain radioactive element and N0 be the number of atoms present in the sample at t=0. After time 3T, what percent of atoms present at t=0 will have decayed?
Correct answer: C. 87.5%
- A. 12.5%
- B. 50%
- C. 87.5%
- D. 100%
Explanation
After 3 half-lives, 1/8 of the original remains, meaning 7/8 (87.5%) has decayed.This is the correct answer.
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