Identify the INCORRECT statement regarding the reflection of sound.
(a) Sound reflects better from hard, smooth surfaces than from soft, porous surfaces.
(b) Both the incident and the reflected sound rays obey Snell’s law.
(c) For a distinct echo to be heard at room temperature, the reflecting surface should be at least about 17m away from the listener.
(d) The reflection of sound obeys the principle of reversibility of paths.