A mixture of `Pu""^(239)` and `Pu""^(240)` has specific activity of `6xx10""^(9)`dps. The half lves of isotopes are `2.44xx10""^(4)` and `6.58xx10""^(3)`years respectively. The percent of `Pu""^(239)` in the mixture is x/10% (nearly). Then 'x' is

A mixture of ""^(239)Pu and ""^(240)Pu has a specific activity of 6 xx 10^(9) dis/s/g. The half lives of the isotopes are 2.44 xx 10^(4) y and 6.08 xx 10^(3) y respectively. Calculate the isotopic composition of this sample.

A sample of Uranium is a mixture of two isotopes ._(92)^(234)U and ._(92)^(238)U present in the ratio 10% and 90% by weight. The half lives of these isotopes are 2.5 xx10^(5) years and 4.5 xx10^(5) years respectively. Calculate the contribution to activity in percentage of each isotope in this sample.

The number of atoms of Chromium and oxygen are 4.8xx10^(10) and 9.6xx10^(10) respectively. Its empirical formula is

A sample of uranium is a mixture of three isotopes ._(92)U^(234), ._(92)U^(235) and ._(92)U^(238) present in the ratio 0.006%, 0.71% and 99.284% respectively. The half lives of then isotopes are 2.5xx10^(5) years, 7.1xx10^(8) years and 4.5xx10^(9) years respectively. The contribution to activity (in % ) of each isotope in the sample respectively

If x=2.4xx10^6 and y=6.0xx^10^(-8) , express xy in scientific notation.

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.