> For light, the velocity varies a little, but it's roughly 300,000 km/s. 
> That means that even if each wave is 1 km long (pretty damn long wave!), 
> it's going to have a frequency of 300 kHz. If you make that wave 1 m 
> long, that becomes 300 MHz, and by the time you get down to an utterly 
> *microscopic* wavelength, you're well above the THz range.

Wikipedia article on "color" has a list of wavelengths and frequencies 

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