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The half life of a radioactive element A...

The half life of a radioactive element A is same as mean life time of another radioactive element B.Initially, both have same number of atoms. B decays faster than A . Why?

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`T_A= tau_B=1.44T_B`
`therefore T_A gt T_B`
`therefore lambda_A lt lambda_B`
Therefore B decay faster than A.
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