Question

help pls it's urgent​

Answer 1

Answer:

An echo is a sound that is repeated because the sound waves are reflected back.

Sound waves can bounce off smooth, hard objects in the same way as a rubber ball bounces off the ground. Although the direction of the sound changes, the echo sounds the same as the original sound.

Explanation:

Hope it helps

Have a good time

Answer 2

Answer:

echo means repeated sound

like when we shout in an empty room we can hear our repeated voice