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What is the half life of a radioisotope if a 100g sample becomes 25g after 18 years?
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∙ 9y ago
9 years
Anonymous
The half-life of the radioisotope is 9 years. This is calculated by determining the time it took for half of the original sample to decay. Since the sample went from 100g to 25g in 18 years, it lost 75g in that time period. After the first half-life, the sample would have 50g remaining, and after the second half-life, it would have 25g remaining.
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