The minimum distance to hear an echo (at 22 deg celsius in air) from a sound reflecting surface is

The minimum distance to hear an echo (at 22 deg celsius in air) from a

1.	The minimum distance to hear an echo (at 22 deg celsius in air) from a sound reflecting surface is
Answer» imum DISTANCE between to hear echo is 2× DD=distance between SOURCE and reflecting SURFACE

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The minimum distance to hear an echo (at 22 deg celsius in air) from a sound reflecting surface is

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