1. The problem statement, all variables and given/known data Radioactive nuclei are produced in an irradiated sample at the rate of 10 s-1. If the number in the sample builds up to a maximum of 1000, calculate the mean life and the half-life of the radioactive nuclei Can anyone advise on this one not sure how mean life is found or if half life is right .. thanks 2. Relevant equations Using dN / dt = P - λ N 3. The attempt at a solution 1000 nuclei / 10s-1 = 100 nuclei s-1 P - λ N = 100 nuclei s-1 (In2) / λ = (In2) / (10 s-1) = 6.93 x10^-2 s-1 is Half life = 6.93 x10^-2 s-1 ??