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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.
Microwaves are a form of RADIO WAVE. They are NOT radiation like something being radioactive, and microwave ovens do NOT make your food radioactive or glow in the dark. There are radiations because the radio wave radiate from a central location (like an antenna) inside the oven. Microwaves are very similar to radar waves.