A 10-(kHz) electromagnetic wave in air with parallel polarization is incident obliquely on an ocean surface at a near-grazing angle θi = 88°. Using ϵr = 81, μr = 1, and σ = 4 (S/m) for seawater, find (a) the angle of refraction θt, (b) the transmission coefficient τ∥, and (c) the distance below the ocean surface where the field intensity has been diminished by 30 (dB).
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