A 10(kHz) parallelly polarized electromagnetic wave in air is incident obliquely on an ocean surface at a near-grazing angle ϕi = 88°. Using ∈r = 81, μr — 1, and σ = 4 (S/m) for seawater, find
(a) the angle of refraction ϕt,
(b) the transmission coefficient T||,
(c) (Pav)r / (Pav)i and
(d) the distance below the ocean surface where the field intensity has been diminished by 30 (dB).
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