NEET Physics Nuclei Questions Solved

The radioactivity of a sample is A1 at a time t1 and A2 at time t2.  If the mean life of special men is T, the number of atoms that have disintegrated in the time interval of t2-t1 is 

(1) A1-A2             (2) A1-A2T               (3) A1-A2T                (4) A1t1-A2t2

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