Question

What is Echo ???????????.....

Answer 1

it is a sound caused by the reflection of sound waves from a hard surface to the listener.
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Answer 2

✌️✌️ hey mate,

❄️ECHO:

➡️A sound caused by the reflection of sound waves from the surface back to the listener.

➡️It is a repeated sound that comes after a delay.

➡️The delay of sound is proportional to the distance of the reflecting surface from the source and the listener.

thanks...
nice to help you ✌️✌️