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7 November, 11:48

A 9 gram sample of a substance that's used for drug research has a K value of 0.1459

Find the substances half-life in days, and round answer to the nearest ten. (exponential decay)

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  1. 7 November, 12:03
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    N = N0 e^ (-kt)

    for half life N/N0 = 1/2 and k = 0.1459

    1/2 = e^ (-0.1459t)

    => - 0.1459 t = ln (0.5)

    t = - ln (0.5) / 0.1459

    = 4.8 days
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