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The half-life of ^40 k is 1.30xx10^9 y. ...

The half-life of ``^40 k` is `1.30xx10^9 y. A sample if 1.00g of pure KCI gives 160 counts `s^(-1)`.Calculate the relative abundance of ``^40K`(fraction of ``^40K`present ) in natural potassium .

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