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The half-life period of a radio-active element X is same as the mean life time

The half-life period of a radio-active element X is same as the mean life time of another radio-active element Y. Initially they have the same number of atoms. Then

Options

(a) X and Y decay at same rate always
(b) X will decay faster than Y
(c) Y will decay faster than X
(d) X and Y have same decay rate initially

Correct Answer:

X will decay faster than Y

Explanation:

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