1.

Starting with a sample of pure \[^{66}Cu,\,\frac{7}{8}\] of it decays into Zn in 15 min. The corresponding half-life is                   [AIEEE 2005]

A.            5 min                                       
B.            \[7\frac{1}{2}\] min
C.            10 min                                     
D.            15 min
Answer» B.            \[7\frac{1}{2}\] min


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