1.

The disintegration constant of radium with half-life 1600 years is    [MHCET 2004]

A.      \[2.12\times {{10}^{-4}}yea{{r}^{-1}}\]  
B.      \[4.33\times {{10}^{-4}}yea{{r}^{-1}}\]
C.      \[3.26\times {{10}^{-3}}yea{{r}^{-1}}\]  
D.      \[4.33\times {{10}^{-12}}yea{{r}^{-1}}\]
Answer» C.      \[3.26\times {{10}^{-3}}yea{{r}^{-1}}\]  


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