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Isn’t all radiation– from colours we can see all the way to microwave and nuclear – just the frequency of wavelengths? Like radio is light waves? So microwaves being a longer wavelength, when it passes through different materials (say, plastics) it can be sped up* and distorted, bringing it into the spectrum of UV light?
I don’t know, I’m not a physicist, but that would be my guess. I’d love for someone with knowledge to educate me here.
e: got my wavelengths reversed
I do know a thing or two since i studied in this subject (no not microwavology), thats why that caught my eye.
Im pretty sure they meant IR radiation.
The problem here is that in order to change a microwave to UV, you need to add energy to it. Generally, diffraction and distortion of light waves don't change what part of the spectrum they're on - that's why water doesn't change the color of light passing through it. The wavelength changes, but critically, the frequency doesn't, and frequency is really what defines the energy of a given photon, which in turn defines the part of the spectrum it's on. So if the microwave is turning into UV somehow, that means it has to be stealing energy from the container or food, which would make the food colder.
I'd expect the only UV rays that would be emitted within a properly functioning microwave would be from the appliance light bulb inside of it if it's still an incandescent design or from the food/container itself if it gets sufficiently hot. I'm not sure of any mechanism in the magnetron that would make UV in any substantial amounts.