In audio, I've learned that sound energy are particles being compressed and rarified at specific rates, causing a "wave of pressure". Thus, sound is represented in a wavelength because of the medium it is "distorting" My barely-elementary understandinf of QED makes me believe that in order for an electron to have a wavelength, it is attracted to the nucleus and repelled by antiparticle collisions between the electron and the nucleus. Is this true or did I misread something? Also, how can light travelling through a vacuum have a wavelength at all? Or is my definition of wavelength convoluted?