Question

For hearing distinct echoes, what should be the minimum distance of the reduced​

Answer 1

Answer:

The sensation of sound persists in our brain for about 0.1 s. Thus, to hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1s.

Answer 2

Answer:

Hence, 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…

Explanation:

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