Question

Write the situation of echo

Answer 1

Conditions to hear an echo:-
(1) The echo must reach our ears atleast after 1/10 seconds we hear the original sound, otherwise we will not be able to distinguish it from the original sound as a sound stays ( persists) in our brain for about 1/10 of a second ( persistence of sound).

(2) The source of sound and the reflecting surface should be atleast 17 m apart for us to hear the echo.