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The radio wave part of the spectrum is very wide. The extreme ends are, roughly,

  • 15km ( used for communicating with submerged submarines)
  • 1 mm ( used for research, and possibly for radar)

The visible spectrum covers only a 2:1 range of wavelengths. It is centred on the colour yellow, with a wavelength ~= 700nm.

The very shortest of the radio waves is about 1000 times as long as yellow light.

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