1.

The ratio of the amount of two element X and Y at radioactive equilibrium is 1 : 2 xx 10^(-6). If the half-life period of element Y is 4.9 xx 10^(-4) days, then the half-life period of element X will be

Answer»

`4.8 xx 10^(-3)` days
245 days
122.5 days
None of these

Solution :`(N_(X))/(N_(y)) = (t_(1//2) (x))/(t_(1//2) (y)) , t_(1//2) (x) = (4.9 xx 10^(-4))/(2 xx 10^(-6)) = 245` days


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