Consider air flow through a thin horizontal tube. The tube length is 2 cm, the diameter is 0.4 mm, and the mean air velocity through the tube is 2 cm s-1. The air entering the tube contains spherical particles of three diameters: 0.03 m, 0.3 m, and 3 m. The particle density is 1 g/cm 3. Estimate the penetration efficiency for each particle size associated with diffusion. Assume that all particles that enter the tube within rc of the tube wall will deposit and assume that none of the particles that enter the tube further than rc from the wall deposit