Wine Glasses,I have to do a science project on how and why wine glasses make nosie. Any information is GREAT!!!
What causes wine glasses to make noise?
June 26th, 2011 · 1 Comment · Wine Stemware
Tags: science project·wine glasses
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norcekri // Jun 26, 2011 at 4:02 pm
Which noise do you mean? The ringing of an empty glass, the tone of rubbing a fingertip around a damp rim, or the lovely tinkle when you tell Mom you’re getting married as she carries a tray of glasses to the dining room?
The ringing is due to the glass being manufactured evenly enough to have a characteristic tone. This is the same principle as a bell: the vibrational modes of the circular, homogeneous cross-section provide the same pitch from all sides. These reinforce to a clear tone. Note that certain bell shapes are actually capable of producing two or three different tones, depending on which area you strike. There was a SciAm article on this about 5 years ago.
The tone as you rub your finger around the rim is the same principle. As you move your finger, the tip slips on the moisture and catches again very rapidly, producing a sequence of tiny strikes along the rim. The ones that are compatible with the glass’s resonant frequency reinforce and sustain the tone; the others dampen to nothing quite rapidly.