1. The problem statement, all variables and given/known data I wasn't sure where to post this question. I hope I picked the right section of the forums. This is from intermediate lab. The lab is for Bragg diffraction using microwaves. The grazing angle is a measured quantity along with the voltage (which was measured using an oscilloscope). The uncertainty on the voltage is estimated. The grazing angle that is recorded is from the angle indicated on the turntable disk that the reflection cube (crystal) sits on. 2. Relevant equations Not sure if the Bragg equation is needed but here it is: n*(wavelength) = 2*(plane spacing)*sin(grazing angle) 3. The attempt at a solution Okay, so I assumed that the uncertainty in the grazing angle would be the uncertainty in the measurement, however my professor told me to measure the error in the angle by the error in the voltage. I have no idea what he means by this. I know about error propagation and the different equations, but have no clue how to use the error in the voltage and translate that to error in the angle. One data set is 3 degrees at a voltage of 290 +/- 1. Any ideas?