A student is revising the phenomenon of reflection of sound for a classroom seminar.
(i) State the two laws of reflection of sound in words.
(ii) With the help of a labelled diagram, describe how an echo is produced when a shout is directed towards a distant cliff. Explain the role of the two laws in this process.
(iii) A rough cloth screen is placed where the cliff was earlier. The student now observes that no echo is heard. Give a reason for this observation based on the laws of reflection of sound.