Planck’s investigation of the Blackbody Radiation spectra of hot objects and the subsequent studies into the Photoelectric Effect had proven that Light was capable of behaving both as a wave and as a particle. It seemed reasonable to wonder if electrons could also have a dual wave-particle (Wavicle) nature. In 1924, French scientist Louis de Broglie (1892-1987) derived an equation that described the Wave nature of any particle. Particularly, the Wavelength (λ) of any moving object is given by:
Related equivalences (only applicable for Light):