Question

Define the term echo.​

Answer 1

hyy mate ✌️

An echo is heard only if the distance between the person producing sound and the rigid obstacle is long enough to allow the reflected sound to reach the person atleast 0.1 second after the original sound is heard.

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Answer 2

Answer:

Hii mate

. An echo is a repetition or imitation of sound. When sound waves hit a hard surface they might reflect, making the sound bounce and repeat. ... You were frightened when you thought someone was following you, until you realized you were only hearing the echo of your own footsteps.

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