Wd-4 Resonance Smashing of a Wine Glass

Aim

To smash a wine glass using sound waves at the resonant frequency.

Apparatus

  • Signal generator
  • Horn loudspeaker
  • P.A. Amplifier
  • Stand and cabinet
  • Wine glass
  • Laser
  • Mirror

Wine Glass Diagram

Wine Glass Resonance Apparatus.

Description

A clean wine glass is positioned a few centimetres from the horn loudspeaker in the cabinet shown above. A light mirror rests against the rim and acts as a detector of resonance. The frequency of the signal generator is swept slowly through the 600Hz to 1600Hz range until resonance is indicated by a circular Lissajous figure projected on the screen. At this point the amplifier output is increased whereby the glass will explode under the action of the rim oscillations.

Video