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Write a note on echo
The repetition of sound caused by the reflection of sound waves is called an echo. When a person shouts in a big empty hall, we first hear his original sound. After a little while, we hear the reflected sound of shout. This 'reflected sound' is an 'echo'. So, when we hear an echo, we are actually hearing a reflected sound, a short while after the original sound. Thus an echo is simply a reflected sound. If we shout at a wall from 300 meters away, the sound takes one second to reach the wall. The sound reflects from the wall, and takes 1 second to return. So, we hear the echo 2 seconds after we have shouted.
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