The electric field component of a uniform plane wave traveling in seawater ( = 4 S/m,

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The electric field component of a uniform plane wave traveling in seawater (σ = 4 S/m, ε = 81 εo, μ = μ) is E = 8e–0.1z cos(ωt – 0.3z)aV/m

(a) Determine the average power density. 

(b) Find the depth at which the power density is reduced by 20 dB.

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