1.

If half-life of radium is 77 days. Its decay constant in day will be                                                  [BCECE 2005]

A.            \[3\times {{10}^{-13}}\]/day 
B.            \[9\times {{10}^{-3}}\]/day
C.            \[1\times {{10}^{-3}}\]/day   
D.            \[6\times {{10}^{-3}}\]/day
Answer» C.            \[1\times {{10}^{-3}}\]/day   


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