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1)Is this sentence right?

When we say for example the wavelength of red light in vacuum is 750 nm it means that the length of electric field and magnetic field that are perpendicular in the propagation direction of wave is 750 nm in one cycle?

2) We say that oscillating charges in antenna produces electromagnetic wave. Does the distance that electromagnetic wave travels in matter depend on the speed of oscillating charges in antenna? if yes what is the formula?

If no how is the calculation of distance?

Thanks