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submitted 11 months ago* (last edited 11 months ago) by olsonexi@lemmy.wtf to c/askscience@lemmy.world

Something that I've noticed across most of the microwave ovens that I've used is that when they hum while cooking food, I can pick out 2 distinct tones. One of them is pretty clearly ~~60~~ 120 hz, the 2nd harmonic of the AC power frequency. The other is consistently a minor 7th above that (which would be somewhere around ~~106-108~~ 212-214 hz depending on the exact ratio). What causes this 2nd frequency to be produced?

Edit: after checking against a tone generator, the low frequency is actually 120 hz, double the grid frequency. The question is still the same, just an octave higher.

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[-] Primarily0617@kbin.social 13 points 11 months ago* (last edited 11 months ago)

frozen peas

it strikes me as weird that somebody operating on your level of elitism considers microwave popcorn acceptable

this post was submitted on 30 Nov 2023
69 points (94.8% liked)

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