Radioactive nuclei decay according to the law: dN -AN. dt N is the concentration of a given nuclide and A is the particular decay constant. In a radioactive series of two different nuclides, with concentrations N1(t) and N2(t), we have: dN1 =-\1N1. dt dN2 = A1N1 – A,N2. dt Find N2(t) for the conditions N1(0) = No and N2(0) = 0.

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