1.

The half-life of \[^{215}At\] is \[100\mu s\]. The time taken for the radioactivity of a sample of \[^{215}At\] to decay to 1/16th of its initial value is                        [IIT-JEE (Screening) 2002]

A.            \[400\,\mu s\]                     
B.            \[6.3\,\mu s\]
C.            \[40\,\mu s\]                       
D.            \[300\mu s\]
Answer» B.            \[6.3\,\mu s\]


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