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Posted by on Friday, May 25, 2012 at 3:13pm.

If you started with 100 grams of Potassium-40 how much would reamin Potassium-40 after 3.9 x 10 to the 9th years?

  • Earth Science - , Saturday, May 26, 2012 at 2:29am

    The half life of K-40 is 1.3*10^9 years.
    That is something they should have told you, or which you have to look up.

    3.9*10^9 years (the approximate age of the earth) is three half lives.

    100g*(1/2)^3 = ??

  • Earth Science - , Thursday, January 7, 2016 at 4:26pm


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