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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.
Answer 1: Microwave ovens produce a type of energy that can travel through the air, called radiation. Light that comes out of light bulbs is also a type of radiation, but we can see this visible light radiation with our eyes. On the other hand, our eyes cannot detect microwaves, so we cannot see the microwave radiation shining down on our food while a microwave oven is running.