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This experiment uses an electromagnetic shaker to produce standing wave patterns on the surface of a vertically oscillating sample of silicon liquid. These surface waves, known as Faraday waves, form shapes such as squares, lines, and hexagons. They are known to be dependent upon the frequency and amplitude of the forcing as well as on the viscosity and depth of the liquid in the dish. At a depth of 4mm and for various silicon liquids having kinematic viscosities of 10, 20, and 38 cSt, we determined the acceleration at which patterns form for frequencies between 10 and 60 Hz. For the 10 and 20 cSt cases, it was found that the acceleration at which these patterns form does not heavily depend upon the viscosity of their host liquid. This is in stark contrast with the current body of knowledge. The case for 38 cSt, however, varies from the other two cases in both value and shape. P 29.751 physics 119 Symposium · Volume 1 Issue 1 2

Viscosity Dependence of Faraday Wave Formation Thresholds