Question

For echo to take place for least distance, the distance between the source of sound and
the reflecting surface should be (Take: sound speed = 340 m/s.persistence time 1/10 s)
(A) 17 cm
(8) 17m
(C) 1.7 m
(D) 34 m​

Answer 1

Answer:

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.

Answer 2

Answer:

The reflecting object must be more than 17.2m from the sound source for echo to be perceived by a person located at the source.

As the sensation of sound persists in our brain for about 0.1 s, to hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1s. If we take the speed of sound to be 344 m/s at a given temperature, say at 22 ºC in air, sound must go to the obstacle and reach back the ear of the listener on reflection after 0.1s. 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. I.e., 34.4/2 = 17.2 m

Explanation:

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