Question

(a) Explain how ‘echo’ is produced. 

(b) What should be the minimum distance between the listener and the reflector to hear an echo of sound propagating with a speed v m s^–1? 

(c) Does the speed of sound increase or decrease on a hotter day? Justify

Answer 1

(a) Echo 

(c) The speed of sound increases with temperature. So on a hotter day speed of sound is more.