Lanthanum has a stable La^(139) and radi...

Lanthanum has a stable `La^(139)` and radioactive isotope `La^(138)` of half life `1.1 xx 10^(10)` years whose atoms are 0.1 % of those of the stable isotope. Estimate the rate of decay or activity of `La^(138)` with 1 kg of `La^(139)` Take Avogadro's number `N=6 xx10^(23) mol^(-1)`

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The correct Answer is:

`8600 s^(-1)`

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