Question

Why can we not hear an echo at every place​

Answer 1

Answer:

Echo:-The phenomenon of reflection of sound from a surface is called echo. They can't hear an echo in small room because in it the sound can't be reflected back. For an echo of a sound to be heard,the minimum distance between the source of sound and the walls of the room should be 17.2 m.

Answer 2

Answer:

they don't have reflecting walls so they can't hear an echo at every place