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A surface is considered rough if protuberance is ________ than critical height.

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A surface is considered rough if protuberance is ________ than critical height.

(a) Equal

(b) Less

(c) Greater

(d) No relation

This question was addressed to me in a job interview.

Query is from Scattering in section Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

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Best answer
Right answer is (c) Greater

To elaborate: A surface is considered rough if its minimum to maximum protuberance is greater than the critical height calculated using Rayleigh criterion. It is considered smooth if protuberance is less than critical height.

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