Why does the sound of poured water gets higher and higher as you keep pouring?
In: Physics
An empty vessel like a glass or bottle is essentially a sound chamber with a resonate frequency (think of blowing across a bottle top to make it ring).
The distance between the bottom and top of the vessel determines the vessel’s resonate frequency (where sound waves of corresponding length vibrate longer than than others).
As the water rises, the distance between the bottom and top of the vessel decreases, which means shorter waves will vibrate longer. Shorter sound waves equals higher pitch.
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