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    destiny009's Avatar
    destiny009 Posts: 1, Reputation: 1
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    #1

    Oct 1, 2009, 02:40 PM
    Half Life Equation
    If the half-life for the radioactive decay of zirconium-84 is 26 minutes and I start with a 175 gram sample, how much will be left over after 104 minutes?
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Oct 2, 2009, 05:22 AM

    Try this site:

    Half-life - Wikipedia, the free encyclopedia
    InfoJunkie4Life's Avatar
    InfoJunkie4Life Posts: 1,409, Reputation: 81
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    #3

    Oct 4, 2009, 03:43 AM


    Time after t minutes = Initial quanity times .5 to the time divided by the half life duration



    10.9375g
    sairah's Avatar
    sairah Posts: 1, Reputation: 1
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    #4

    Oct 8, 2009, 12:35 PM
    what you do is divide 104 mintues by 26, to see how many half lifes there are you need to find out. In this case it is 4. so all you do is divide
    1st half life: 175/2= 87.5g
    2nd half life: 87/2= 43.75g
    3rd half life: 43.75/2= 21.875g
    finally
    4th half life: 21.875/2= 10.9375g

    easy peasy!
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