What is an echo.

Q8. What is an echo?
Ans. An echo is when you shout in a large empty hall or in a tunnel, and you hear the noise ringing back out at you a moment or two later. The echo is simply the sound of the voice bouncing back from the walls. You don’t normally hear echoes, because they only bounce back clearly off smooth, hard surface and in confined spaces. Even in a confined space, the walls must be at least 17 meters (55 ft) away, because you will hear an echo only if it bounces back at least 0.1 second after you shouted.

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