Mathematics, 12.08.2020 06:01 amandagewecke88
An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 70% more of the substance? (Round your answer to one decimal place.) hr
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An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 70% more of th...
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