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Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography


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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 Harmonic Motion
 Open / Closed Resonance Tube
 Resonant tunning fork
  video  - Dancing Flames (Ruben's Tube)
  video  - Air Driven Organ Pipe
 Singing Tubes and Rods
 Chladni Figures
  video  - Breaking a Wine Glass



To demonstrate the principles of vibrating strings.


As the sonometer strings are bowed, the harmonic nodes may be shown by stopping the wire with the edge of the rubber eraser at 1/2, 1/3, 1/4, etc. of its length. A tuning fork is struck and then the stem is placed solidly on the sonometer. When the wire is tuned to the frequency of the fork, sympathetic resonance can be heard.


  • Sonometer
  • Rubber Eraser
  • Tuning Forks
  • Violin Bow