The sound heard after reflection from a distant obstacle after the original sound has ceased, is called an echo.
(ii) Two conditions for an echo to take place are:
(a) The minimum distance between the source of sound and the reflector must be 17m
(b) The minimum time taken by the reflected sound to reach the listener should be 0.1s
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The sound heard after reflection from a distant obstacle after the original sound has ceased, is called an echo.
(ii) Two conditions for an echo to take place are:
(a) The minimum distance between the source of sound and the reflector must be 17m
(b) The minimum time taken by the reflected sound to reach the listener should be 0.1s