There have been a few methods described in this journal and elsewhere for measuring the wavelength of the standing electromagnetic waves in a microwave oven. Typically, these involve melting chocolate, cheese, or some other substance on a plate that is prevented from rotating. In this article I describe a more dynamic and colorful technique that utilizes a temperature-sensitive liquid crystal sheet. With this method one can not only measure the wavelength of the microwaves, but also calculate the speed of these waves, which intriguingly turns out to be the speed of light. It also has the advantage of looking more like a wave than the other methods.
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TECHNOLOGY IN THE CLASSROOM| April 01 2019
An improved technique for visualizing microwave wavelengths in microwave ovens
Phys. Teach. 57, 271 (2019)
James Lincoln; An improved technique for visualizing microwave wavelengths in microwave ovens. Phys. Teach. 1 April 2019; 57 (4): 271. https://doi.org/10.1119/1.5095399
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