A 500kHz antenna carried by an airplane flying over the ocean surface generates

Question

A 500kHz antenna carried by an airplane flying over the ocean surface generates a plane wave that is normally incident upon the ocean's surface with an electric field amplitude of 3,000 V/m. Seawater is characterized by epsilonr = 72, mur = 1, sigma = 4(s/m). The plane is trying to communicate with a submarine submerged to a depth d below the surface of the water. If the submarine's receiver requires a minimum signal amplitude of 0.1 muV/m, what is the maximum depth d the submarine can go before communication becomes impossible?

Explanation / Answer

This is one of the ones I cant figure out for my assignment due tomorrow morning!

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