= 3. Given a nonmagnetic material having &,' 3.2 and 1.5 x 10 S/m, find numerical values at 3 MHz for the (a) loss tangent; (b) attenuation constant; (c) phase constant; (d) intrinsic impedance 4. Ignoring reflection at the air-soil boundary, if the amplitude of a 3 GHz incident wave is 10 V/m at the surface of a wet soil medium, at what depth will it be down to 1 mV/m? Wet soil is characterized by μr = 1, &,= 9, and σ = 5 × 10+ S/m.