Hello everyone, We know Davisson & Germer experiment confirms the wave nature of electron(matter). Positions of Constructive Interference produces high intensity. So at different scattering angle intensity should be different. That's fine I understand why scattering angle(position) matters for position of maximum intensity as it happens at the position of Constructive Interference. What I am not getting is why it needs a particular accelerating voltage for getting a peak of intensity they say Davisson and Germer find the intensity peak occurs at 54V and 50° scattering angle, and they go on to say that peak intensity at a particular angle shows Constructive Interference which is a characteristics of wave hence electrons are showing wave nature. I agree that the fact that scattered X-ray light(from Crystal)has Maxima at a particular angle makes it logical to consider electrons as wave but I am not getting here the role of accelerating voltage and why accelerating voltage affects position of maximum intensity and why accelerating voltage affect peak intensity. Below is a picture of intensity curves for different voltages at different angles. Thanks a bunch.