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How long would it take 4.0 ˛ 1020 atoms to decay to 1.0 ˛ 1019 atoms if their half-life was 14.7 years?

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How long would it take 4.0 ˛ 1020 atoms to decay to 1.0 ˛ 1019 atoms if their half-life was 14.7 years?






 
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