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    Rhoda_97's Avatar
    Rhoda_97 Posts: 2, Reputation: 1
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    #1

    Nov 30, 2011, 05:55 PM
    the equation is N=O(0.5)t/h
    Trying to help my nephew over the phone. He says h is 30 years, we have 500 grams of element-90 and 60 years has passed
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Nov 30, 2011, 11:23 PM
    Just... use the equation?



    h = 30
    N = 500
    t = 60

    Find O.
    Rhoda_97's Avatar
    Rhoda_97 Posts: 2, Reputation: 1
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    #3

    Dec 12, 2011, 01:08 PM
    Thank you. Seems so easy now.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Dec 12, 2011, 09:53 PM
    You're welcome :)
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