define echo. expain the conditions for hearing an echo
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An echo is a reflection of sound, arriving at the listener some time after the direct or original sound. The main conditions for hearing an echo are:-
1) There should be minimum distance of 17 m between the source of sound and the reflector.
2) There should be a time gap of 0.1 sec between the original sound and the sound received after reflection.
1) There should be minimum distance of 17 m between the source of sound and the reflector.
2) There should be a time gap of 0.1 sec between the original sound and the sound received after reflection.
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Echo :
The reflection of sound from a distant obstacle ( hill , any hard obstacle , polished substance ) after the original sound has ceased is called an echo .
The conditions are as follows :
(i) The minimum distance should be 17 m between the reflecting surface and source.
(ii) The intensity of sound should be large enough .
(iii) The size of reflector should be large enough .
(iv) The time to reach the echo should be minimum 0.1 s .
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