In a photoelectric experiment using a sodium surface, you find a stopping potential of 2.01 V for a wavelength of 290 nm and a stopping potential of 0.885 V for a wavelength of 393 nm. From these data find (a) a value for the Planck constant, (b) the work function Φ for sodium, and (c) the cutoff wavelength λ0 for sodium. (a) Number Units (b) Number Units (c) Number Units