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What is the minimum distance (in metres) required to hear an...

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Physics
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What is the minimum distance (in metres) required to hear an echo?

Answer & Solution
Correct Answer: Option C
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 17.2 m from the sound source for echo to be perceived by a person located at the source.
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