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The sound which we hear after reflection is called echo or echo of sound. One can hear the echo by shouting loudly in a big hall. After shouting loudly, the same sound reaches the ears after reflecting from the surface of the wall. Echo of sound can be heard by producing sound at a place surrounded by hills or big buildings.
Thus, repetition of sound because of multiple reflections of a sound wave is called echo.
The condition necessary for the creation of echo:
The condition necessary for the creation of echo:
One does not experience any echo sound in a small room. This does not mean that sound does not get reflected in a small room, but necessary conditions for the production of echo are not present.
Any sound persists in one’s brain for up to 0.1 seconds of time. So echo can only be heard if the same sound comes to one’s ear after a lapse of 0.1 seconds. Thus, a reflection of sound must reach the brain after a lapse of 0.1 seconds.
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