The problem is to apply Schrodinger wave equation to a beam of mono energetic electrons and show that the probability of finding electron at each point on the beam is constant (d2ψ/dx2) + (8∏^2m/h^2)(E-V)ψ = 0 I have been taught to apply this to a single particle for various cases(potential wells, potential barriers and potential steps). But I don't know how to apply this for a beam of electrons. I would appreciate any help. Thank you P.S. - I have no idea how to go about approaching the problem. So, I am unable to show any work. I apologize.