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

    May 21, 2009, 04:21 PM
    half-life equations
    A 64-g sample of germanium-66 is left undistured for 12.5 hours. At the end of that period, only 2.0 g remain. What is the half-life of this material?
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    May 21, 2009, 07:09 PM
    a 64-g sample of germanium-66 is left undistured for 12.5 hours. At the end of that period, only 2.0 g remain. What is the half-life of this material?


    where is the half-life

    Half-life - Wikipedia, the free encyclopedia





    Take the of both sides. Note that this is an unusual base, but it simplifies the processing since . You could use any logarithm base, but this makes the algebra easier.







    ashwanth's Avatar
    ashwanth Posts: 4, Reputation: 1
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    #3

    May 31, 2009, 05:19 AM

    there is one more way
    calculate the number of atoms in 64g of germanium .This is u'r N0(pronounced as N not i.e initial no of atoms) Now calculate the number of germanium atoms in 2g Nt.
    Now use the formula k=2.303 * log(No/Nt) / t where t-12.5 hrs
    now t1/2 = 0.693/k

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