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How Microwaves Cook Food. When you hit the start button it usually takes about 2 seconds to heat up a filament inside the magnetron tube, says Schiffmann. The microwaves are then blasted into the food compartment. The commonly used frequency of microwaves, 2.45 gigahertz, is easily absorbed by water, fat, and sugar.
Microwave diathermy produces heat in the body tissues through application of microwave energy to the concerned area. The microwave energy stimulates tissue molecules, as r.f. diathermy does, converting electrical energy to heat.he present informal position of the Food and Drug Administration is that a diathermy device should be capable of producing heat in tissue from a minimum of 104 F to a maximum of 114 F at a depth of two inches in not more than 20 minutes.