The minimum distance between the source of sound and the reflecting surface necessary to cause echo is

1.7 m

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17 m

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7 m

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70 m

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Solution

The correct option is B $17 m$
The human ear can hear two sounds distinctly only if there is a time interval of $\frac{1}{10}$ seconds between them. Now, the speed of sound in air at $20^{0}$ C is $340 m / s$ , so the distance traveled in $\frac{1}{10}$ seconds will be:
Distance = Speed X time
$= 340 \times \frac{1}{10} = 34 m$
Thus, it is possible to hear the echo at the minimum distance of $\frac{34}{2} = 17 m$ between the source of sound and reflecting surface.

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