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

    Nov 1, 2010, 11:32 PM
    Half Life Problem
    An examination of the tissue sample revealed that 46% of the carbon-14 present in his body @ the time of his death had decayed. The half-life of carbon-14 is approximately 5728 years. How long ago did this man die?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Nov 1, 2010, 11:58 PM

    You can make use of the formula:



    Where N is the initial amount of C-14 (100%).
    No is the amount of C-14 left (100% - 46%).
    t is the time you are looking for.
    h is the half life.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Nov 2, 2010, 12:12 AM

    Hm... radioactice decay in general. It is used in several fields.
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