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