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

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

1.	The half-life period of a radio-active element X is same as the mean life time of another radioactive element. Initially they have the same number of atoms. Then
Answer» X will decay FASTER than Y Y will decay faster than X X and Y have same decay RATE initially. X and Y decay at same rate ALWAYS Answer :B

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

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