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The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342 m/s, calculate the distance of the reflecting surface.
Let $s$ be the distance between the sound source and the reflecting surface. For echo, it is necessary that it travels $2s$ distance as illustrated in the figure:
Here time is taken $t=5\ seconds$
Speed of the sound $=342\ m/s$
We know the speed distance formula:
$distance=speed\times time$
Or $2s=342\times 5$
Or $2s=1710\ m$
Or $s=\frac{1710}{2}$
Or $s=855\ m$
Therefore, the distance of the reflecting surface from the origin or sound source is $855\ m$.
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