The disintegration constant of `.^(238)U` is `1.54 xx 10^(-10) "years"^(-1)`. Calculate the half life period of `.^(238)U`.

The decay constant of ^238U is 4.9xx10^-18 s^-1. (a) What is the avarage-life of ^238U ?(b)What is the half-life of ^238U ?(c) By what factor does the activity of s ^238U sample decreases in 9xx19^9 years?

A rock is found to contain U-238 and Pb-206 in the ratio of 3 : 2. If t""_(1//2) of U-238 is 4.5xx10""^(-9) years. Calculate the age rock?

The decay constant of U^238 is 4.9xx10^-18 s^-1. (a) What is the avarage-life of U^238 ?(b)What is the half-life of U^238 ?(c) By what factor does the activity of s U^238 sample decreases in 9xx19^9 years?

(a) On analysis a sample of uranium ore was found to contain 0.277g of ._(82)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. Calculate the age of ore.

The half-life of "_92^238U undergoing alpha decay is 4.5 xx 10^9 years. Calculate the activity of 10 g sample of "92^238U .

(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.