In a photoelectric experiment using a calcium surface, you irradiate the surface with five different wavelengths and find five corresponding stopping potentials: # > Vo 1. 260 nm 1.93 V 2. 87 nm 11.76 V 3. 347 nm 0.76 V 4. 217nm 2.77 V 5. 390 nm 0.31 V Plot a graph of the Stopping Potential versus Frequency of the light. What is the theoretical value of the slope of this plot? x10-15 J . s/C What value did you find? x10-15 J . s/C What is your value for the cutoff frequency? X 1015 Hz