Why are microwaves used rather than visible light?

For cooking:-- The molecules of water and fat resonate at microwave frequencies, but do not resonate at light frequencies. The meatloaf would absorb very little energy from light. -- We pump microwaves into the cooking chamber at levels of 1,000 to 1,500 watts,making it possible to boil a cup of water in two or three minutes.

It's not easy to generate 1,000 to 1,500 watts of light. The ways we have of doing that still comewith great amounts of heat ... inconvenient in a kitchen appliance. -- In order to set up the proper standing-wave pattern inside the MW oven, the walls of the cooking chamber need to be separated by exactly a whole number of wavelengths.

It's quite a bit easier to manufacture them accurately to a multiple of 12 centimeters than to a multiple of 0.000075 centimeter (red light). For communication:-- Rain, snow, sleet, fog, dust, and smoke in the air have a much greater effect on light than on microwaves. For communication, the effects are all bad.

-- At the present state of technology, we are very good at putting information on a beam of microwaves, but not so good at putting information on a beam of light.

Visible light and microwaves have different properties; light is useful for some things, microwaves for others, and other frequency ranges (of electromagnetic waves) yet for others.

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