$(20$ pts$.)$ Calculate the removal efficiency of a $1m$ unit$-$density particle using a wet scrubber $($spray

chamber$)$ with operating conditions of $\frac{Q_L}{Q_G}=1\mathrm{.}2\frac{L}{m^3},V_G=18c\frac{m}{s},d_d=300m,z=3\mathrm{.}5m,$ and

${}_g=1\mathrm{.}8{10}^{-4}\frac{g}{c}m.s$