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...
Do you also observe this when running the microwave on max power? Usually, when a microwave states its 800 watts but you can adjust it down, it actually only changes the duration that power is supplied. So 400 watts would be 50% of the time the power is supplied at max.
Why do many microwave ovens hum in an interval of a minor 7th?
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...
Zoom orders workers back to the office ( www.bbc.co.uk )
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