A uniform plane wave is traveling downward into a medium characterized by Mr = 1, &r = 9, and o = 5 x 10^-4 S/m. The plane wave has an amplitude of 10 V/m and frequency of 3 GHz. (a) Is this medium considered a lossless medium, a low loss medium, or a good conductor? Please provide your rationale. (b) Obtain an expression for the average power density (in terms of downward depth z). (c) Determine the depth at which the power density is reduced by 40 dB