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An electromagnetic wave has a velocity "c", the universal wave equation velocity = wavelength * frequency

the wavelength then equal c / frequency

then the wavelength of that wave is : Lambda= c / Nu

= 299792458 / 3*1000000 = 99.930819333333333333333333333333 meters ~ 100 meters

(Lambda is the wavelength, Nu is the frequency).

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To summarize:

Wavelength = (speed) / (frequency) = (3 x 108) / (3 x 106) = 102 = 100 meters, in vacuum

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