Some data for the kinetic energy of ejected electrons as a function of the wavelength of the incident radiation for the photoelectron effect for sodium metal are   λ/nm 100 200 300 400 500   Ke/eV 10.1 3.94 1.88 .842 .222   Plot these data to obtain a straight line and calculate h from the slope and the work function psi from its intercept with the horizontal axis

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