Question

what is an echo?its urgent​

Answer 1

Answer:

echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is directly proportional to the distance of the reflecting surface from the source and the listener.

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Answer 2

Answer:

a repetition of sound produced by the reflection of sound waves from a wall, mountain, or other obstructing surface. a sound heard again near its source after being reflected.