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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.
Can Magnetrons Be Replaced in Microwaves? In a microwave oven, it's the magnetron tube that creates the electromagnetic waves necessary to heat the food placed in it. Those waves move through food, exciting the water and fats inside it. As those substances move faster and faster, friction results, and this creates heat in the food.