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Q. To hear a distinct echo, the time interval between the original sound and reflected sound must be atleast ______.
Answer: 0.1 seconds
Notes: Echo is defined as the reflection of sound, arriving at the listener some time after the direct sound. As the sensation of sound persists in 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.

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