A microwave is a form of electromagnetic radiation in the frequency range between 300 MHz (or 0.3 GHz) and 300 GHz. A microwave is also the "shorthand" name we give to a common appliance called a...
The microwave generating component of a microwave oven is called a magnetron. The magnetron is actually a vacuum tube (a vacuum diode, actually) that has an associated set of magnets. This tube (the...