Question

Sound made in front of a tall building 18 M away is repeated name the phenomena and briefly explain it

Answer 1

The phenomenon is called as echo.

Echo-the sound heard when the sound waves strike on a surface (cliff,hill,building,etc..)and reflect back to the reciever.

Answer 2

This phenomenon is called an echo.

echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is proportional to the distance of the reflecting surface from the source and the listener. Typical examples are the echo produced by the bottom of a well, by a building, or by the walls of an enclosed room and an empty room. A true echo is a single reflection of the sound source.