36 question solution

​Q36. A sample of radioactive substance decays simultaneously by two processes A and B with half lives 1/2 and 1/4 h respectively. For the first half hour it decays with process A, next one hour with process B, and for further half an hour with both A and B. If originally, there are N0 nuclei, then the Number nuclei after 2 h of such decay 

   1   N 0 2 8                                                 2   N 0 2 4                                     3   N 0 2 6                           4 N 0 2 5

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