1. The problem statement, all variables and given/known data 1)The graph below represents the ground state wave function of an electron in a finite square well potential of width L. The potential is zero at x = 0. The wave function of the electron within the well is of the form A cos( 2πx / λ ) where A is a normalization constant. What is the approximate value of λ, within about 10%? 2. Relevant equations A cos( 2πx / λ ) and the left and right boundaries are at +- 400pm 3. The attempt at a solution At 0pm cos(2pi x/lambda) = 1 so A has to be .075 then it looks like at 300pm y is .05 so: .05 = .075*cos(2pi * 300pm / lambda) lambda = 2pi * 300pm / cos-1(.075 / .05) = 2241pm but this is wrong Or if i used 400pm as a data point: 2pi * 300pm / cos-1(.075 / .05) = 2041pm (still wrong) What am i doing wrong here?