1. The problem statement, all variables and given/known data So I had to find out N=Noe-ux Where No=1.5,e is the elementary charge, u=-0.068 and x=0.07 I came to the answer 1.221 Now I need to find x if u =-0.036, N=1.221 and No remains 1.5 2. Relevant equations 3. The attempt at a solution I reduce the equation to the following ln(N/No)=-ux The problem is that when I plug my numbers from the original problem into this I end up getting the following ln(1.221/1.5)=-(-0.068)x -0.2058=0.068x -3.02= x This is clearly incorrect since I know x should be 0.07. Any help would be greatly appreciated. Thank you.