1. The problem statement, all variables and given/known data If the uncertainty in the location of a nonrelativistic particle is about equal to twice its de-Broglie wavelength, show that the uncertainty in its velocity is greater than about 4% of its velocity. 2. Relevant equations ΔpΔx>h/4Pi p=mv Δx=2nλ 3. The attempt at a solution I've put the above equations together and manipulated them but I'm not really sure how to get to, Δv>0.04v using the above formulae. An indication of where to begin would be greatly appreciated.