Mathematics, 30.10.2021 14:50 jamayeah02

As an isotope of lead, 201Pb, has a half life of5.2 hours. How many hours ago was there 25% more of the substance? Round your answer to 2 decimal places.

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As an isotope of lead, 201Pb, has a half life of5.2 hours. How many hours ago was there 25% more of...

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