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At 2.4 GHz, yes.  It's called a microwave oven. Not good for you.


At 27 MHz, it's for "medicinal purposes". :LOL:  Perhaps someone can use that excuse when the FCC comes knocking?


Short wave diathermy operations use the ISM band frequencies of 13.56, 27.12, and 40.68 megahertz. Most commercial machines operate at a frequency of 27.12  MHz, a wavelength of approximately 11 meters.


https://en.wikipedia.org/wiki/Diathermy