WHY CAN YOU NOT HEAR THE ECHO IF YOU STAND 10 M AWAY FROM THE WALL
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because it would not have that much intensity
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To hear the echo we need to stand at least 17 m away from the object. This is because, distance traveled by sound in 1/10 second = speed x time = 340 m/s x (1/10) s = 34 m. Thus, we cannot hear the echo if you stand 10 m away from a wall and shout towards it.
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