Physics for IGCSE & O level - Atoms And Radioactivity (Section 4 - No. 35)
If a radioactive substance has a half-life of 1 year, and we start with 100g, how much will be left after 2 years?
50g
25g
100g
12.5g
Explanation
After 2 years, two half-lives have passed, so 100g -> 50g -> 25g
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