ICSE Class 10 Physics 2013 Solved 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
Total: 70
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
1
l
)
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