Question

give reasons : why do we hear echo in empty room where as we don't hear any echo in room filled with different materials​

Answer 1

Answer:

So, the reason that echoes aren't heard in rooms is that the reflected sounds are received in less than 0.1 seconds, or the reflecting surfaces are at distances of less than 17 meters. Reverberations can also be heard in an empty apartment.

Answer 2

Answer:

Echo is heard when the sound gets reflected back. In an empty room, the sound is reflected by the walls so the echo is heard. But in a living room there are so many sound absorbers present like curtains, furniture etc. They absorb sound instead of reflecting them and thus reduces the possibility of echo in the room.

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