1. The problem statement, all variables and given/known data Data obtained in a photoelectric experiment: Wavelength (nm): 140, 117, 93.3, 70.0 Maximum Kinetic Energy of Photoelectrons (eV): 2.76, 4.50, 7.19, 11.61 From the graph, determine an experimental value for Planck's constant (in joules-seconds). 2. Relevant equations Frequency (c/wavelength): 21.43E14, 25.64E14, 32.15E14, 42.85E14 Maximum Kinetic Energy of Photoelectrons (eV): 2.76, 4.50, 7.19, 11.61 Conversion factor: 1.6E-19 J / 1 eV 3. The attempt at a solution Plotting Kmax (y-axis) and Frequency (x-axis), generates the equation: y = 0.4132x - 6.0936 h(Planck's constant) = slope * conversion factor * 1 / 10E14 (frequency factor) Experimental h value is: 6.6E-34, which is incorrect! Please help me find the experimental value of Planck's constant. Thank you!