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

(a) 3.61×1010     (b) 3.6×1012
(c) 3.11×1015     (d) 31.1×1015

(Avogardo's number N = 6.02×1026 atpm/kilomol)

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