question_answer

The decay constant of a radioactive element is \[\lambda \] The half life and mean life of a sample are respectively, given by :

A) \[\frac{\lambda }{{{\log }_{e}}2}and\frac{1}{\lambda }\]                              

B) \[\lambda ({{\log }_{e}}2)and\frac{1}{\lambda }\]

C) \[\frac{{{\log }_{e}}2}{\lambda }and\frac{1}{\lambda }\]                              

D) \[\frac{1}{\lambda }and{{\log }_{e}}2/\lambda \]