Half - life period of a Radioactive element X is same as the mean - life time of another radio active element Y. If initially both have same number of atoms then

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X decay faster than Y

Y decay faster than X

X and Y decay at same rate

Initial decay rate of X and Y are same

answer is B.

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Detailed Solution

T1/2X=TmeanY0.693λx=1λyλx=0.693λyλy>λxSo Y decay faster

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