hey everyone, i have a question i'm trying to solve here for class any help would be SO apreciated ! "In the Davisson-Germer experiment, 54.0-eV electrons were diffracted from a nickel lattice. if the first maximum in the diffraction pattern was observed at 50 degrees (as in the figure). what was the lattice spacing a between the vertical rows of atoms in the figure? (it is not the same as the spacing between the horizontal rows of atoms)"