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Microwaves (such as the world famous 2.4Ghz variety in a kitchen microwave oven) have a longer wavelength than visible light Red being 430THz and violet being 750THz.

c=fλ (c is the speed of light 300,000,000 m/s, f frequency in Hertz and λ in metres)

2.4GHz has a wavelength of a few centimetres. This is why you need a turnplate in a microwave to avoid the hotspots that are only a few centimeters apart.

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