Running Tap Water

It is a common experience for many people that when we open a tap to fill a bucket with water, the sound becomes shriller and shriller as the water in the bucket gets filled. The phenomenon which explains this is the pitch.

Pitch is that characteristic of sound by which an acute (or shrill) note can be distinguished from a grave or flat one. If the pitch is high, the sound is shrill, and if the pitch is low, the sound is flat. The pitch of a note depends on its frequency.

Now, why does the sound from the bucket gets shriller as the water gets filled?


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