Physics for IGCSE & O level - Atoms And Radioactivity (Section 5 - No. 49)
How many half-lives have passed when a radioactive sample has decayed to 1/8 of its original amount?
1
2
3
4
Explanation
After three half-lives, the sample is reduced to 1/8 of its original amount (1/2 * 1/2 * 1/2 = 1/8).
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