The concept that waves carrying energy may have a corpuscular aspect and that particles may have a wave aspect; which of the two models is the more appropriate will depend on the properties the model is seeking to explain. For example, waves of electromagnetic radiation need to be visualized as particles, called photons, to explain the photoelectric effect while electrons need to be thought of as de Broglie waves in electron diffraction. See also complementarity; de Broglie wavelength; light.