1. The problem statement, all variables and given/known data Hello, i was doing an experiment in which you shine different colours of light onto a cathode and apply negative voltage to the anode so that the photo current reduced to a constant value. I obtained the average stopping potential for each wavelength of light (green yellow blue violet turquoise) and now i was going to plot average stopping potential versus frequency. Now the gradient of this graph multiplied by the charge of the electron gives me plancks constant (h=e(ΔV/Δf)). However my problem is, does the line of best fit go through the origin or not?