we can't hear the echo.explain.why?
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NO WE XAN HEAR ECHO IF WE WILL STAY AT A MINIMUM DISTANCE TO HEAR YGE ECHO
GOR EX AT THE SPEED OF SOUND IN AIR 344 M/S
THEN WE HAVE TO STAY AT A DISTANCE OF 17. 4 M
THE THING IS TO STAY AT THE MINIMUM DISTANCE
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