Question

why can't we hear an echo in a small room?
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Answer 1

The repetition of sound caused by reflection of sound waves is called an echo.

For a echo to be heard, the minimum distance between source of sound and the reflector should be 17.2m

In a small room the distance must be less than 17.2m

So you can't hear the echo in a small room.

Hope This Helps You!

Answer 2

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.

And
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.Obviously,in a small room echoes cannot be heard.