NEET Physics Nuclei Questions Solved


A radioactive sample with a half-life of 1 month has the label : 'Activity = 2 microcurie on 1-8-1991'. What would be its activity two months earlier? [1988]

(1) 1.0 microcurie        (2) 0.5 microcurie            (3) 4 microcurie             (4) 8 microcurie

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