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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.
A)Microwaves are electromagnetic waves. The microwave oven generates these and directs them into the cavity where food is placed. The microwaves act on the water molecules i â¦ n food, and because the water molecules are polar, they will attempt to orient themselves according to the passing microwaves.