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What is an echo? State two conditions ...

What is an echo?
State two conditions necessary for hearing an echo.

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Echo: Sound reproduced due to the reflection of the original sound.
a) Conditions necessary for hearing an echo:
(i) The minimum time gap between the original sound and echo must atleast 0.1 s.
(ii) The minimum distance required to hear an echo is 17.2 m.
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