I have recently graphed my Planck's Constant data from my Planck's Constant kit on Excel. The R squared value is great but there are a few things that confuse me. 1. I presume that the Equation of V = f(h/e) - W/e can be used with y = mx + c If so, then I presume that my equation of y = 3e-15x - 1.2163 from excel can solve the equation: c = -1.2163 = The work function (I find this a bit strange though because the cathode is covered in cesium which is meant to be 2.13 eV) V = y = backing voltage f(h/e) = gradient = m Is this right? Or do are my presumptions wrong? Also is the letter for frequency f or v? Because there seems to be some variation whenever I attempt to browse sites.