what are the conditions for an echo
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Echo : An echo can be defined as the phenomena of the reflection of sound produced by a source placed in a relatively open environment after it hits a distant obstacle like a cliff etc. The sound waves that have bounced back can be heard at the source a few seconds after it was produced.
(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.
(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.
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an echo is heard only if the distance of the person producing sound from the rigid obstacle is long enough to allow the reflected sound to reach the person at least 0.1 second after the original sound is heard
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