Obtain theoptimum time and maximum concentration of 'R' in Ak1Rk2S (first order)conducted in a CSTR.(May-2004, Dec-2005-Bio &May-2006-Bio) and 100 lit/hr of a radioactive fluid having a half-life of 20hr is to be treated by passing it throughtwo ideal stirred tanks in series. The volume of each stirred tank is 40,000 liters. In passingthrough this system, by how much has the activity decayed? The reaction follows first order kinetics with a constant density