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OpenStudy (anonymous):
HALF-LIFE QUESTION: The half-life of polonium is 139 days, but your sample will not be useful to you after 95% of the radioactive nuclei present on the day the sample arrives has disintegreated. For about how many days after the sample arrives will you be able to use the polonium? Formulas: Half-life = ln2/ k and y=yoe^-kt
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