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Suppose the amount of a certain radioactive substance in a sample decays from 1.70 mg to 500. g over a period of 64.9 years.

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Suppose the amount of a certain radioactive substance in a sample decays from 1.70 mg to 500. g over a period of 64.9 years. Calculate the half life of the substance. Round your answer to 2 significant digits. years G

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