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A sample of rock contains 0.232 g of 206Pb and 1.605 g of 233U. Assuming all lead present today comes from 238U decay, calculate the

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A sample of rock contains 0.232 g of 206Pb and 1.605 g of 233U. Assuming all lead present today comes from 238U decay, calculate the time since the first occurrence of the rock. (t12 238U = 4.5 x 109 y)

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