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Question 35
To hear a distinct echo the time interval between the original sound and the reflected
sound must be at least:
Solution
Echo. ... 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, the sound must go to the obstacle and reach back the ear of the listener on reflection after 0.1s.
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