The half life of radium is 1620 years and its atomic weight is 226 kgm per kilomol. The number of atoms that will decay from its 1 gm sample per second will be [MP PMT 1993; BVP 2003]

• A.            \[3.61\times {{10}^{10}}\]      
• B.            \[3.6\times {{10}^{12}}\] 
• C.            \[3.11\times {{10}^{15}}\]      
• D.            \[31.1\times {{10}^{15}}\] (Avogadro's number \[N=6.02\times {{10}^{26}}\]atom/kilomol)