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U^(238) is found to be in secular equili...

`U^(238)` is found to be in secular equilibrium with `Ra^(226)` on its ore. If chemical analysis shows 1 nuclei of `Ra^(226)` per `3.6xx10^(-6)` nuclei of `U^(238)`, find the half-life of `U^(238)`. Given the half-life is 1500 years.

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The correct Answer is:
`0.26`
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