Why can we hear echoes in long galleries and | vedclass

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(A) An echo is the repetition of sound caused by the reflection of sound waves from a hard surface.For an echo to be heard distinctly,the time interva

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Due to the reflection of sound from walls.

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(A) An echo is the repetition of sound caused by the reflection of sound waves from a hard surface.For an echo to be heard distinctly,the time interval between the original sound and the reflected sound must be at least $0.1 \, s$.Since the speed of sound in air is approximately $344 \, m/s$,the total distance traveled by the sound in $0.1 \, s$ is $34.4 \, m$.Therefore,the minimum distance between the source of sound and the reflecting surface must be half of this,which is $17.2 \, m$.In long galleries and big halls,the dimensions are large enough to provide this minimum distance,allowing the reflected sound to reach the listener after the required time interval,thus creating an echo.

Why can we hear echoes in long galleries and big halls?

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