Question

what is an echo what is the principle of formation of echo​

Answer 1

Answer:

Every one must have heard of the word echo. Echo is basically a sound heard after the sound is reflected back when the actual sound has stopped. Thus the echo is the result of reflection. If we want to hear an echo, we cannot do it in a small room, we need a large area. When we shout in a large or vacant space, the sound is reflected back.

Suppose you are standing in front of a high wall and clap your hand, you can hear the same sound of the clap back again. This is an echo. An echo is heard when the distance between the person producing sound and the rigid obstacle is long enough to allow the reflected sound to reach the person least 0.1 seconds after the original sound is heard. Otherwise, the echo is not distinguished even on reaching the ears. This value can be calculated and comes out to be 17.2 m for air and 70 m for water.Whenever echo is to be heard the time between two objects or body or points should be 0.1 sec.

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Answer 2

Answer:It is a reflection of sound that arrive at the listiner with a delay after the direct sound.

Explanation: