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     EduGorilla 
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    The half-life of 131I is 8 days. If we have a sample of 131I at time t = 0, we can assert that

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    1. no nucleus will decay before t = 4 days
    2. no nucleus will decay before t = 8 days
    3. all nuclei will decay before t = 16 days
    4. a given nucleus may decay any time after t = 0
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