Question

What is an eco ? State 2 condition for eco

Answer 1

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.

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Answer 2

An echo is the repetition of the original sound heard after the sound is reflected from a distant dense and rigid object.

2 conditions for echo are:-

1. The sound is loud enough to be

heard after reflection.

2. The min. distance between the

source of the sound and the

reflecting surface is 17 cm.

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