1. The problem statement, all variables and given/known data Consider a radiactive decay problem involving two types of nuclei, A and B, with populations Na(t) and Nb(t). Suppose that type A nuclei decay to form type B nuclei, which then also decay, according to differential equations: 2. Relevant equations dNa/dt = - Na/Ta dNb/dt = Na/Ta - Nb/Tb where Ta and Tb are the decay constants. Na(0) = 100 and Nb(0) = 0. 3. The attempt at a solution I solved the equation for Na(t) and got 100*e^(-t/Ta), but I'm not sure about Nb. Intuitively, I think it has to be something like: 100*(1 - e^(-t/Ta))*e^(-t/Tb) but I know this is wrong any advice/ideas?