what is a microwave?

Question

i need to know for a project.

Answer 1

Microwaves are a form of electromagnetic radiation. They have relatively short wavelengths compared to toher types of radio waves, so they have higher frequencies. The word "microwave" is a misnomer, though, because the wavelength is not in the micrometer range; the wavelengths are between 1 mm and 30 cm. Microwaves are best known to most people as the form of energy used by microwave ovens to cook food. This works because most food has a high water content, and water is a polar molecule. It moves in order to align itself with the radiation, and this movement generates heat.

Answer 2

A microwave works because: The food contains water, the h2o has an electric diapole (very much like a magnet but thats a magnetic diapole), that means that it has a positive and a negative end.

the electromagnetic fiel generated aligns the h2o molecules.But when all of them are alingned the field gets inverted so the h2o ). This inversions happen 2500 million times per second, which generates heat by friccion.So de food warms because the molecules rotate generating heat.

Answer 3

according to wikipedia.com, Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) wavelengths, but relatively short for radio waves. Microwaves have wavelengths approximately in the range of 30 cm (frequency = 1 GHz) to 1 mm (300 GHz). This range of wavelengths has led many to question the naming convention used for microwaves as the name suggests a micrometer wavelength. However, the boundaries between far infrared light, terahertz radiation, microwaves, and ultra-high-frequency radio waves are fairly arbitrary and are used variously between different fields of study. The term microwave generally refers to "alternating current signals with frequencies between 300 MHz (3 × 108 Hz) and 300 GHz (3 × 1011 Hz)."[1]