What is the minimum time interval required between a sound and its reflected copy so…

PHYSICS · Single correct · CBSE · Physics · Sound · Sound

Problem

What is the minimum time interval required between a sound and its reflected copy so that the latter is heard as a distinct echo by a normal human ear? (a) 0.0625 s0.0625\,\text{s} (b) 0.05 s0.05\,\text{s} (c) 0.1 s0.1\,\text{s} (d) 0.01 s0.01\,\text{s}

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