Question

For a radioactive material, its activity A and rate of change of its activity R are defined as A = - dN/dt and
R = dA/dt, where N (t) is the number of nuclei at time t. Two radioactive sources P (mean life ????) and
Q(mean life 2????) have the same activity at t = 0. Their rates of change of activities at t = 2???? are R???? and R????,
respectively. If R????/R???? = n/e, then the value of n is

Answer 1

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