Variations on a theme by a singing wineglassKuan-Wen Chen1, Chih-Kai Wang1, Chin-Ling Lu1 and Yih-Yuh Chen2, 3, 4
1 Hong-wen Senior High School - Taichung, Taiwan, ROC
2 Physics Department, National Taiwan University - Taipei, Taiwan, ROC
3 Institute of Astrophysics, National Taiwan University - Taipei, Taiwan, ROC
4 National Center of Theoretical Sciences at Taipei - Taipei, Taiwan, ROC
received 12 October 2004; accepted in final form 14 March 2005
published online 30 March 2005
A "singing wineglass" is a glass which generates a more or less pure tone when one rubs its rim with a wet finger. The frequency of this tone is lowered when water or wine is poured into the glass. One usually associates this downward frequency shift with an effective mass contributed by the liquid to the vibrating wineglass. We present experimental work and simplified theoretical models to show that this idea requires modifications for a couple of counter-intuitive phenomena.
43.20.+g - General linear acoustics.
62.30.+d - Mechanical and elastic waves; vibrations.
© EDP Sciences 2005