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What percent of an original sample remains after 3 half-lives? After 5 half-lives?
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What percent of an original sample remains after 3 half-lives? After 5 half-lives?

User DrWeeny
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Three half lives corresponds to (12)3 . So a 18 quantity of the original isotope is retained. And the percentage of quantity of a radioactive material that remains after 5 half-lives will be . ∴NN0×100=10032=3.125.

User Zentaurus
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