What happens to the resonant frequency of a wine glass as you fill it

AI Thread Summary
Filling a wine glass with water affects its resonant frequency, typically leading to a decrease in frequency as the glass fills. This counterintuitive result occurs because the added mass of the water lowers the frequency, despite the higher pitch of splashing sounds. Observations of similar behavior in other vessels, like watering cans, support this phenomenon. The discussion raises the possibility of confusion between measuring resonant frequency and wavelength. Understanding these acoustic principles clarifies the relationship between water levels and sound characteristics in various containers.
06mangro
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As you fill a wine glass with water, how does the resonant frequency change?
Surely it should increase? i did an experiment and it decreased?
I am so confused!?
Why does this happen?
 
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As you fill a tall glass the sound of the splashing gets higher pitched. The same thing characterizes the filling of a garden watering can, etc. You can gauge how close it is to overflowing by the tone.

Are you sure you weren't determining wavelength in your experiment?
 
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