The electrical parameters of the soil are given as a = 5.10-4, r = 1, er = 9. If the amplitude of the plane wave at 3 GHz frequency coming perpendicular to the air-soil boundary is 10 V/m on the soil surface, diffusion constant formula.) I. Determine whether the ground is a good or a poor conductor at this frequency and derive an approximate expression of the propagation constant for the current case. Then determine the value of the phase constant and attenuation constant. What is the skin thickness of the medium at this frequency? At what depth does the amplitude of the wave decrease to 1mV/m? (Ignore reflection from the ground surface.) II. III.