An echo is heard from a distant cliff after an interval
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Explanation:
An echo is heard from a distant cliff after an interval of 1.2 s. If the speed of sound in air is 340m/s , caculate the distance of the cliff.
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0.1 sec
Explanation:
The sensation of sound persists in our brain for about 0.1 sec. To hear a distinct echo, the time interval between the original and reflected sound must be at least 0.1sec.
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