The minimum distance required for hearing distinct echoes is calculated by multiplying the speed of sound by the time interval (0.1 seconds) and halving the result. For example, at a speed of 344 m/s, the minimum distance is (344 m/s) × 0.1 s ÷ 2 = 17.2 meters.
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The minimum distance required for hearing distinct echoes is calculated using the formula: distance = speed of sound × (time for echo to return) / 2, ensuring the echo delay is at least 0.1 seconds for perception.