Answer:
A bucket may be regarded as a pipe closed at one end. It produces a note of frequency, \[v=\frac{\upsilon }{4L}\] where v is the velocity of sound in air and L is the length of air column, which is equal to depth of water level from the open end. As the bucket is filled with water, the value of L decreases. Consequently, the frequency and hence the pitch of the sound produced goes on changing.
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