To hear a distinct echo each time interval between the original sound and the reflected sound must be:a. 0.2 sb. 1 s c. 2 s d. 0.1 s
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 $=\frac{distance}{speed}=\frac{34}{340}=0.1\ s$
Therefore, option d. is correct.
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