To hear a distinct echo, what is the minimum distance required between the source of sound and the reflecting surface? (Take speed of sound in air as 344 m/s)

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A 17.2 meters
B 34.4 meters
C 51.6 meters
D 8.6 meters

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Answer: A. 17.2 meters

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• Explanation: A) 17.2 meters is correct because the total distance traveled down and back must take at least 0.1 seconds for the human brain to distinguish it (344 × 0.1 ÷ 2 = 17.2 m).

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To hear a distinct echo, what is the minimum distance required between the source of sound and the reflecting surface? (Take speed of sound in air as 344 m/s)

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