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The half life period of a radioactive el...

The half life period of a radioactive element x is same as the mean life time of another radioactive element y. Initially they have the same number of atoms.Then :

A

y- will decay faste than x.

B

x - will decay faster than y.

C

x and y decay at the same rate always.

D

x and y have same decay rate initially and later on different decay rate.

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