What should be the time interval between the originated sound and the reflected sound to heard distinctly?

The minimum distance of the sound source from the surface is required at least $17.1\ m$ for echo.

Therefore, the total distance traveled after reflection $d=17.1+17.1=34.2\ m=34\ m(approx.)$

We know the velocity of the sound at $25^{\circ}$ room temperature is around $340\ m/s$

Therefore, time interval $=\frac{distance}{speed}=\frac{34}{340}=0.1\ s$

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Updated on: 10-Oct-2022

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