Question

Surface roughness are often tested using __________

(a) Rayleigh criterion

(b) Lawson criterion

(c) Barkhausen stability criterion

(d) Nyquist criterion

The question was posed to me during an internship interview.

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

Answer 1

Right choice is (a) Rayleigh criterion

The best explanation: Rough surface is often tested using a Rayleigh criterion. It defines the critical height of surface protuberances for a given angle of incidence. The Rayleigh criterion is the criterion for the minimum resolvable detail. The imaging process is said to be diffraction-limited when the first diffraction minimum of the image of one source point coincides with the maximum of another.