Physics for IGCSE & O level - Atoms And Radioactivity (Section 6 - No. 8)
If a sample has a half-life of 10 years, how much of the original radioactive material will remain after 20 years?
All of it
One-half
One-quarter
One-eighth
Explanation
After 2 half-lives, 1/4 of the original material remains.
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