Choose the incorrect statement

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Choose the incorrect statement

1.An echo is heard only if the distance of person producing sound is long enough to allow the reflected sound to reach a person at least 0.1 sec after original sound is heard

2.time taken to hear echo is 2d/v

3.To hear the echo distinctly the reflecting surface in air should be at minimum 17m distance.

4.The size of reflector should be small enough as compared to wavelength of the sound

Posted Date:-2022-01-10 15:19:00

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