1.

The decay constant of a radioactive element is \[1.5\times {{10}^{-9}}\] per second. Its mean life in seconds will be         [MP PET 2001]

A.            \[1.5\times {{10}^{9}}\]   
B.            \[4.62\times {{10}^{8}}\]
C.            \[6.67\times {{10}^{8}}\]
D.            \[10.35\times {{10}^{8}}\]
Answer» D.            \[10.35\times {{10}^{8}}\]


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