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3. The half-life of a certain drug in the human body is 8 hours how long it would take for a dose of this drug to decay to 0.1% of its initial level?

  • math -

    (1/2)^(t/8) = 0.1
    t = 79.72 hours

    Makes sense, since .1% = 1/1000
    and 10 half-lives (80 hours) is 1/1024

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