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A uranium mineral contains .^(238)U and ...

A uranium mineral contains `.^(238)U` and `.^(206)Pb` in the ratio of 4 : 1 by weigh. Calculate the age of the mineral, `t_(1//2) .^(238)U = 4.5 xxx 10^(9)` years. Assume that all the lead present in the mineral is formed from disintegration of `.^(238)U`.

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