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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.
In a microwave oven, food is cooked by exposing it to microwave radiation. Microwaves are a form of radiofrequency (RF) electromagnetic energy. When this energy comes in contact with food, the absorbed energy causes the water molecules in the food to rotate.icrowave ovens are used daily in restaurants, cafeterias, lounges, kitchens, snack bars, and homes. Some microwave oven users may be concerned about potential health hazards from the exposure to microwave radiation leakage.