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Lec 29 | MIT 8.02 Electricity and Magnetism, Spring 2002
see there, that the speed of electromagnetic radiation depends on the wavelength, depends on the frequency, we call that dispersion. It is a good thing that sound in air is not dispersive, because -- just imagine that high frequencies would travel faster than low frequencies, just as an example. Or, or slower, for that matter. It would mean, then, that if you go to a concert, and you would listen to the violins and the bass, that the violins would reach you first, and then the sound of the ...