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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.
But how does this great invention work? Here, we explore the science behind one of the most revolutionary household appliances of the 20th century. Microwaves Are A Form Of Energy. Microwaves are electromagnetic waves that fly through space at the speed of light.