"Any body immersed partially or completely in a fluid experiences an upthrust which is equal to the weight of the fluid displaced by the immersed part of the body"
Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.
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