Remove the turntable from the microwave oven, place a large bar of chocolate in there (maybe raise it a bit on a plastic plate).
Run the microwave oven, with luck and skill you can get melted chocolate spots at the antinodes.
Measure the distance between the spots, double it and you have the wavelength. Look up the frequency on the back of the microwave oven, use the wave equation and calculate c. Then eat the chocolate.
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