Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538
Demonstrations are cataloged according to PIRA Bibliography
PLEASE REQUEST DEMOS WELL IN ADVANCE
Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.
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video - Breaking a Wine Glass
Purpose:To demonstrate the resonance behavior of a wine glass.
Set the wine glass in front of the horn driver (speaker). The approximate resonance frequency of the glass will be written on the base of the glass and the PASCO function generator will be set to that frequency. Set the classroom projector to the appropriate camera which allows the class to view the glass from above. Turn ON the strobe lamp.
1. First show how the glass moves at resonance by setting the function generator amplitude to a "low" setting such as 2 to 3 Volts. If needed, adjust the strobe lamp frequency to slow down or speed up the apparent motion of the lip of the wine glass.
2. Now try to break the glass at resonance by increasing the amplitude of the function generator. If the glass does not break, then gently sweep the frequency up or down. If glass still does not break, try another glass.
A.P. French, "A study of wineglass acoustics", American Journal of Physics, 51, 688 (1983).