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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 ovens use high power electromagnetic radiation (radio) at a frequency. close to 2.5 GHz to do the job of cooking. Much of the design of the appliance goes into making sure that very little of that. radiation is given off, and that it stays inside the cooking chamber where it belongs.icrowave radiation is electromagnetic radiation (waves) in the microwave portion of the electromagnetic spectrum. (An electromagnetic wave is a moving electrostatic and magne â¦ tic field. The fields are at right angles to each other, and they move through space in just this way-as moving fields.