Question

find the minimum distance of the reflecting surface to hear an echo in air when the speed of sound in air is 344 m/s​

Answer 1

Answer:

17.2 meters

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Step-by-step explanation:

Answer 2

Answer:

Here's your answer:

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.