Refraction modelQuick View
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Refraction model

(2)
Simple flash model of a lorry driving across a landslide that shows how a wave is refracted. Rescued from the now defunct TRE
Oscilloscope Simulator or SuperpositionQuick View
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Oscilloscope Simulator or Superposition

(3)
I wanted a foolproof way of showing superposition and wondered if it could be done in Excel. This is the result. I use the resulting graph on the Interactive Whiteboard sometimes as examples of different types of waves.