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

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SUMMARY

As a wine glass is filled with water, its resonant frequency decreases rather than increases. This phenomenon occurs due to the added mass of the water, which lowers the frequency of the glass's vibrations. The discussion highlights the confusion surrounding the relationship between water level and sound pitch, noting that while splashing sounds may increase in pitch, the fundamental frequency of the glass itself diminishes. The experiment conducted by the user confirms this decrease in resonant frequency as the glass fills.

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Physics students, acoustics researchers, and hobbyists interested in sound experiments will benefit from this discussion on the resonant frequency of wine glasses as they fill with water.

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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