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Potassium-argon dating is used in geology and archeology to date sedimentary rocks. potassium 40 decays by two different paths: 4040019201kcae−→+(89.3%)4040019 181kare→+(10.7%)the overall half-life of for the decay of potassium-40 is 1.3 x 109 years. estimate the age of sedimentary rocks with an argon 40 to potassium 40 ratio of 0.0102.
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