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How many half-lives must elapse until 81 % of a radioactive sample of atoms has decayed?

How many half-lives must elapse until 81 % of a radioactive sample of atoms has decayed?
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How many half-lives must elapse until 81 % of a radioactive sample of atoms has decayed?

User Jjramsey
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2.23 half-lives must elapse.
User Dimitris Maragkos
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