What is echo?what factors are important toget a distinct echo?
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the repitition of sound from a hard surface is called an echo.
there should be must a distance of 17.2 metres to hear an echo.
there should be time taken exactly of 0.1 seconds
there should be must a distance of 17.2 metres to hear an echo.
there should be time taken exactly of 0.1 seconds
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