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14 November, 14:54

The half-life for the radioactive decay of calcium-47 is 4.5 days. how many half-lives have elapsed after 27 days?

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  1. 14 November, 14:56
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    1 half-life - 4.5 days

    x half-lives - 27 days

    x = (1*27) / 4.5=6

    6 half-lives have elapsed after 27 days.
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