Question

What is an echo? What are the inportant factors to get a distinct echo?

Answer 1

heya
echo is the reflection of sound

Answer 2



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What is an echo? When can we distinctly hear the echo of a sharp sound ? Why cannot we hear an echo in n small halls?

CBSE Class 9 CBSE Class 9 Science 

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prasanna

Jul '16

An echo is the phenomenon of repetition of sound of a source by reflection from an obstacle. For hearing an echo, the obstacle must be situated at a suitable distance from the source. Due to persistence of hearing the sound must take at least 1/10* of a second in reaching the listener. If d is the minimum distance of the reflecting object from the source, then time t taken to cover the distance 2d must be 1/10 th second. '
Therefore, t = 2d/V or d= Vxt/2 = 340 x 1/20
= 17 m.
Echoes are not heard in a small room because the distance is less than the minimum distance of 17 m required for hearing the echo distinctly.

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