1. The problem statement, all variables and given/known data I'm just making sure I have the correct parameters for a linear graph. The experiment used a diffraction tube to verify deBroglie's hypothesis. The goal is to find the correct lattice spacings in graphite for d(10) and d(11). This might be lacking in pertinent information, but I imagine this experiment is pretty widely done. 2. Relevant equations lambda=1.23/sqrtVoltage sin4(theta)=Diameter/Length to screen Bragg equation: nlambda=2dsin 3. The attempt at a solution I think if you plot d vs 1/sqrtV you'll get a linear graph, or at least I thought that. I know this is relatively easy, but I feel like I've just missed something important.