Natural uranium consists of _______ % of `U^(235)` and ______ % of `U^(238)`.

The natural uranium consists of three isotopes ""_(92)^(238)U, ""_(92)^(235)U and ""_(92)^(234)U in the ratio 99.274 : 0.720, 0.006. Find the average atomic mass of uranium.

The relative rates of diffusion of U^(235)F_6 and U^(238)F_6 are

Natural uranium is a mixture of three isotopes _92^234U , _92^234U , _92^235U and _92^238U with mass percentage 0.01%, 0.71% and 99.28% respectively. The half-life of three isotopes are 2.5xx10^5yr , 7.1xx10^8yr and 4.5xx10^9yr respectively. Determine the share of radioactivity of each isotope into the total activity of the natural uranium.

Natural uranium is a mixture of three isotopes _92^234U , _92^234U , _92^235U and _92^238U with mass percentage 0.01%, 0.71% and 99.28% respectively. The half-life of three isotopes are 2.5xx10^5yr , 7.1xx10^8yr and 4.5xx10^9yr respectively. Determine the share of radioactivity of each isotope into the total activity of the natural uranium.

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

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?

"_92U^235 and "_92U^238 differ as