(a) This theory was given on the basis of duel nature of light.
(b) According to de-Broglie theory each and every moving particle has some wave nature associated with itself which is called matter waves.
(c) Thus, moving particles like e– , proton, neutron, α-particle etc, also behave like waves.
(d) These waves are waves of probability.
(e) The wavelength associated with a moving particles is given by λ = h/p, where p is the momentum of the particle.
(f) This wavelength is known as the de-Broglie wavelength of the particle.