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PURPOSE: To show two-dimensional standing waves in a metal plate.
DESCRIPTION: Sand is sprinkled onto a circular or square thin metal plate, which is then stroked along the edge using a violin bow. The sand moves to nodal lines of the standing wave pattern. Stroking at one point while holding your finger at another point to forces a node at that point, if desired, creating a variety of standing wave patterns.
SUGGESTIONS: Practice bowing technique.
REFERENCES: Available. (PIRA 3D40.30)
EQUIPMENT: Plates with holding clamp, bow and sea sand.
SETUP TIME: 10 minutes.
