Question
For a radioactive material, its activity A and rate of change of its activity R are defined as A=−dNdt and R=−dAdt, where N(t) is the number of nuclei at time t. Two radioactive sources P(mean life τ) and Q (mean life 2τ) have the same activity at t = 0. Their rates of change of activitites at t = 2τ are RP and RQ, respectively. If RPRQ=ne, then the value of n is