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In 99 days the number of radioactive nuclei decreases to one-eighth the number present initially. What is the half-life (in days) of the material? Number Units

In 99 days the number of radioactive nuclei decreases to one-eighth the number present initially. What is the half-life (in days) of the material? Number Units

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In 99 days the number of radioactive nuclei decreases to one-eighth the number present initially. What is the half-life (in days) of the material?
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