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The field strength of the surface wave of flat earth is given by ____

(a) E=AE0/d

(b) E=AE0/λ

(c) E=dE0/A

(d) E=λE0/A

I have been asked this question in a job interview.

This intriguing question originated from Radio Wave Propagation topic in chapter Radio Wave Propagation of Antennas

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Right answer is (a) E=AE0/d

To explain I would say: The field strength of the surface wave of flat earth is given by E=AE0/d, here A is the ground attenuation factor, d is the distance and E0 is the field strength per unit distance. The field strength of the wave at a unit distance from transmitting antenna depends on both on the power radiated by the transmitting antenna & directivity in vertical and horizontal planes

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