this post was submitted on 13 Sep 2023
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and different parts of the body resonate at different frequencies...~~part of the reason ~2.4 GHz was picked for the common household microwave is water molecules resonate there~~ (and other harmonically related frequencies too... it's why a lot of the unlicensed ISM stuff is allocated there: crappy atmospheric propagation). also the necessary magnetron and waveguide for that freq is conveniently sized for a kitchen appliance and not too complicated.
EDIT: see proper principle of operation in reply below