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A sample of uranium is a mixture of thre...

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

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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.

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.

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The present day abundances of the isotopes U^(238) and U^(235) are in the ratio of 128: 1. They have half lives of 4.5times10^(9) years and 7times10^(8) years respectively.If age of earth in (49X)/(76)times10^(7) years, then calculate X (Assume equal amount of each isotope existed at the time of formation of the earth)

SL ARORA-ATOMS, NUCLEI AND MOLECULES-Problem
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  9. The isotope of U^(238) and U^(235) occur in nature in the ratio 140:1....

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  13. In the chemical analysis of a rock the mass ratio of two radioactive i...

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  14. A sample of uranium is a mixture of three isotopes .(92)U^(234), .(92)...

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  17. The element curium .96^248 Cm has a mean life of 10^13s. Its primary d...

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