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8 answers

A maser/magnetron.

2006-11-14 09:06:06 · answer #1 · answered by feanor 7 · 0 0

A microwave oven works by passing microwave radiation, usually at a frequency of 2450 MHz (a wavelength of 12.24 cm), through the food. Water, fat, and sugar molecules in the food absorb energy from the microwave beam in a process called dielectric heating. Many molecules (such as those of water) are electric dipoles, meaning that they have a positive charge at one end and a negative charge at the other, and therefore rotate as they try to align themselves with the alternating electric field induced by the microwave beam. This molecular movement creates heat as the rotating molecules hit other molecules and put them into motion. Microwave heating is most efficient on liquid water, and much less so on fats and sugars (which have less molecular dipole moment), and frozen water (where the molecules are not free to rotate). Microwave heating is sometimes incorrectly explained as a rotational resonance of water molecules, but this is incorrect: such resonance only occurs at much higher frequencies, in the tens of gigahertz. Moreover, large industrial/commercial microwave ovens operating in the 900 MHz range also heat water and food perfectly well.

2006-11-14 17:12:34 · answer #2 · answered by Sorcha 6 · 0 0

Your microwave contains a ceramic and metal vacuum tube which when excited emits a large amount of very high frequency (microwave) energy. This microwave energy has a very short wavelength and when it contacts matter inside the oven chamber it is converted to heat.

2006-11-14 17:10:56 · answer #3 · answered by B Scott 4 · 0 0

Elves

2006-11-14 17:13:01 · answer #4 · answered by Anonymous · 0 0

Watch bigbamg

2006-11-14 18:14:34 · answer #5 · answered by mousumiab 2 · 0 0

a frequency generator, it transforms the 60Hz from the power supply and generates HF radiation

2006-11-14 17:06:25 · answer #6 · answered by Anonymous · 0 0

uhhh.......microwaves used to cook the food

2006-11-14 17:09:36 · answer #7 · answered by ravensfan106 3 · 0 0

radio waves.

2006-11-14 17:06:40 · answer #8 · answered by reactor215 2 · 0 0

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