1. The problem statement, all variables and given/known data Ok,as part of my dissertation I'm trying to explain about how quarks have a bigger quantum wavelength than protons so when you localise a quark inside a proton, the uncertainty in energy of the system becomes really big so there's a load of creation/anhilitation of other particles going on inside the proton. This is how my supervisor explained it but I'm not sure I get it... 3. The attempt at a solution This is what my supervisor said; (I'm using D as 'uncertainty in', and h means h bar) to work out quantum wavelength of a proton; Start with Heisenberg 1)DpDx>h (for a start I think this should be h/2) 2)then use E=pc ------I don't understand why you can use this- it's not a realtivistic case. My supervisor said it works if you say that the proton is gaining energy by being hit with photons... but then 3) sub equation (2) into(1) DE>hc/Dx but the momentum in 1) is the momentum of the proton and in 2) its the momentum of the photon so how does that work? 4) then you sub in E=mc^2 to get; Dx>hc/mc^2 and the quantum wavelength is h/mc I don't think this is right does anyone have a better argument?