the minimum distance to hear an echo is?
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1
Explanation:
the distance between the listener and reflecting surface should be atleast half of the above calculated distance i.e. 17.2km.
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4
Answer:
The velocity of sound in dry air approximately 343 m/s at the temperature of 25 degree Celsius . Therefore the reflecting object must be more than 17.2 m from the sound source for the echo to be perceived by a person located at the source
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