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

For echo to take place for least distance, the distance between the so

1.	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» 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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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​

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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