In a good conductor, the electric field of a wave propagating in the z direction is measured at z=0 and found to be ē(0,t)= x 10 cos(3π x 10^8t) V/m The electric field measured at z=0.5 m is ē(0.5,t)= x 7.3cos(3π x 10^8t – θ) V/m a) Find the attenuation constant a in Np/m: b) Find the phase angle θ:
