What is the minimum time interval that must elapse between a sound and its echo so…

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

Problem

What is the minimum time interval that must elapse between a sound and its echo so that the echo is heard distinctly? (a)

0.05\ \text{s}

(b)

0.10\ \text{s}

(c)

0.067\ \text{s}

(d)

0.20\ \text{s}