On analysis a sample of uranium are was found to contain 227g of `._(82)Pb^(208)` and 1.667 g of `._(92)U^(238)`. The half life peiod of `U^(238)` is `4.51 xx 10^(9)` yrs. If all the lead was assumed to have come from decay of `._(92)U^(238)`, what is the age of the earth?

On analysis a sample of .^(238)U ore was found to contain 20.6g of ._(82)^(206)Pb ad 23.8g of ._(92)^(238)U . The half life period .^(238)U is 4.50 xx 10^(9) years. If all the lead were assumed to have come from decay of ._(92)^(238)U , what is the age of the ore?

(a) On analysis a sample of uranium ore was found to contian 0.277g of ._(82)Pb^(206) and 1.667g of ._(92)Pb^(206) and 1.667g of ._(92)U^(238) . The half life period of U^(238) is 4.51xx10^(9) year. IF all the lead were assumed to have come from decay of ._(92)U^(238) , What is the age of earth? (b) An ore of ._(92)U^(238) is found to contain ._(92)U^(238) and ._(82)Pb^(206) in the weight ratio of 1: 0.1 The half-life period of ._(92)U^(238) is 4.5xx10^(9) year. Caluculate the age of ore.

A sample of uranium mineral was found to contain Pb^(208) and U^(238) in the ratio of 0.008 : 1. Estimate the age of the mineral (half life of U^(238) is 4.51 xx 10^(9) years).