Echo minimum distance for distinct hearing (speed sound = 340 m/s, persistence = 0.1 s):

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Time for to-and-fro: t = 2d/v ≥ 0.1 s ⇒ d ≥ vt/2 = 340×0.1/2 = 17 m. Minimum distance for brain to distinguish echo from original sound. Memory tip: 'd_min = v×persistence/2'. Application of sound reflection with human perception limit, common in competitive exam numericals.

Echo minimum distance for distinct hearing (speed sound = 340 m/s, persistence = 0.1 s): MCQ with Answer and Explanation

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