NEET Physics Nuclei Questions Solved

A radioactive sample is α-emitter with half life 138.6 days is observed by a student to have 2000 disintegration/sec. The number of radioactive nuclei for given activity are
(a) 3.45×1010               (b) 1×1010
(c) 3.45×1015               (d) 2.75×1011

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