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For hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be _______ m.

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34.4

340

17.2

180

answer is C.

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Detailed Solution

We can distinguish between the two sounds only when the difference between the sounds is 0.1s.

Therefore, the total distance covered by the sound from the point of generation to the reflecting surface and back should be at least (344 m/s) × 0.1 s = 34.4 m.

Thus, for hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be half of this distance, that is, 17.2 m.

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