Question

Production of an Echo ...........
Short note

Answer 1

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.

Answer 2

Reflection of sound is called echo.It is produced when a sound hitsa surface and gets reflected towards the source of sound.
or

Echo : An echo can be defined as the phenomena of the reflection of sound produced by a source placed in a relatively open environment after it hits a distant obstacle like a cliff etc. The sound waves that have bounced back can be heard at the source a few seconds after itwas produced.
(1) The echo must reach our ears atleast after 1/10 seconds we hear the original sound, otherwise we will not be able to distinguish it from the original sound as a sound stays ( persists) in our brain for about 1/10 of a second ( persistence of sound).
(2) The source of sound and the reflecting surface should be atleast 17 m apart for us to hear the echo.