Physics for IGCSE & O level - Atoms And Radioactivity (Section 1 - No. 25)
If the half-life of a radioactive substance is 10 years, what fraction of the original substance will remain after 20 years?
1/2
1/4
1/8
1/16
Explanation
After two half-lives (20 years), 1/4 of the original substance will remain.
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