(a) On analysis a sample of uranium ore was found to contian `0.277g` of `._(82)Pb^(206)`
Channel: Doubtnut
Date: 2020-08-02

(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.