For the plane wave in a lossy nonmagnetic medium (rural ground epsilon_r = 14, sigma = 7mS/m), find the phase and group velocities at the operating frequency of the wave, and determine whether the medium is non-dispersive, normally dispersive or anomalously dispersive at that frequency. For lossy nonmagnetic medium, you may consider beta = omega squareroot epsilon mu/2 [squareroot 1 + (sigma/omega epsilon)^2 + 1]^1/2.
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