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ICSE Class 10 Physics 2013 Paper

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A bucket kept under a running tap is getting filled with water. A person sitting at a distance is able to get an idea when the bucket is about to be filled.
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Question : 18 of 70
Marks: +1, -0
What change takes place in the sound to give this idea?
Solution:  
As the bucket is filled, the length of air column decrease. The frequency of sound appear to be increase f∝1lf \propto \frac{1}{l}
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