1. The problem statement, all variables and given/known data A wavelength measurement gives Lambda= 6000 x 10^-10m with an accuracy of one part in a million. What is the minimum uncertainty in the position of the photon? 2. Relevant equations deltaP*deltaX > h/4pi p = h/lambda 3. The attempt at a solution In order to solve, I know deltaP has to be expressed in terms of deltaLambda. Delta lambda is (6000 x 10^-10)(1 x 10^-6) = 6 x 10^-13. delta P = dp/dLambda * deltaLambda I'm not sure how to solve this relationship to get an expression for deltaLambda, to plug back into the original deltaX > h/(4pi)(deltaP) Once I get the expression for momentum in terms of lambda, I think I just sub it back in and solve for deltaX. Any help? or have I done anything wrong so far?