The dimensions of a simple settling chamber for air pollution control are 5 m width and 5m height and 10 m long. Suppose the air flow rate is 20 m3/sec. Calculate the (a) Residence time of the settling chamber (b) Particle settling velocity in the chamber (c) Settling time of the particles in the chamber (d) Collection efficiency or air purification efficiency of the chamber? Assume a particle density of 1922 kg/m3, diameter 50 m and gas viscosity =0.0000180068 kg.m.s.