Question: A rock recovered from far underground is found to contain 0.86 mg of 238U, 0.15 mg of 206Pb, and 1.6 mg of 40Ar. How much

A rock recovered from far underground is found to contain 0.86 mg of 238U, 0.15 mg of 206Pb, and 1.6 mg of 40Ar. How much 40K will it likely contain? Assume that 40K decays to only 40Ar with a half-life of 1.25 x 109 y. Also assume that 238U has a half-life of 4.47 x 109 y.

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