Question

What do you mean
by
an echo? two points
​

Answer 1

Answer:

In audio signal processing and acoustics, 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. ... A true echo is a single reflection of the sound source.

Answer 2

Answer:

⬇️⬇️

Echo is the sound heard after reflection from a rigid surface such a cliff a hillside, the wall of the building etc... So from the rigid surface because the sound heard after the reflection...