The minimum distance required to hear an echo is 17m . (show with the help of calculations)
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Answer:
17.2 m
Step-by-step explanation:
The velocity of sound in dry air is approximately 343 m/s at a temperature of 25 °C.
Therefore, the reflecting object must be more than 17.2m from the sound source for echo to be perceived by a person located at the source.
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