The air between two closely separated large plates in a scalted glass tube is uniformly ionised by ultraviolet ragdiation. The air volume between the plates is equal `500cm^(3)`, the observed saturation current is equl to `0.48muA`. Given that at saturation on an average ions take 1 s in travelling from one plate to another. Find:
(a) The equilibrium concentration of ions in saturation state.
(b) The production rate of iron pairs if the recombination coefficient for air ions is equal to `r=1.67xx10^(-6)cm^(3)//s`. Consider that the rate at which ion pairs recombine is given as r`N^(2)` where N is the ion concentration.