The analysis of a uranium reveals that r...

The analysis of a uranium reveals that ratio of mole of `.^(206)Pb`and `.^(238) U` in sample is 0.2 . If effective decay constant of process `.^(238)U rarr .^(206) Pb` is `lambda` then age of rock is

`1/lambda lnfrac (5)(4)`

`1/lambda ln ((5)/(1))`

`1/lambda lnfrac (4)(1)`

`1/lambda ln (6/5)`

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