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    larry421's Avatar
    larry421 Posts: 1, Reputation: 1
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    #1

    Oct 31, 2010, 09:19 AM
    Half-Life
    The half life of molybdenum-99 is 67 hours. A 200 ug quanity decays over time to 25mg.
    HOw much time has elapsed?
    Using the equation mf = mi (0.5)n
    log mf = log mi+n ( log 0.5 )
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 31, 2010, 09:22 AM

    What have you done so far?
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