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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.
Well to understand this first you should know how a microwave oven works. A microwave oven works on the microwave frequency which is 2.45Ghz. Well this frequency is capable ofâ¦ heating water particles more because of the greater absorption factor. The water particles in the food is heated which in turn heats the food in microwave oven. Now lets take the case of 'egg'.