### equations for the photoelectric effect

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**Tue Nov 24, 2015 12:22 pm**On Question 3b of the midterm, the question asks for the energy required to remove the electron from the metal surface. I calculated the work function (energy of the photon - kinetic energy of the electron). Why is the answer (1.66 x 10^-17 J) equivalent to only the energy of the photon if information for the kinetic energy was provided in part a? Is this because part b gave minimum frequency of radiation to emit electrons, and therefore, we should disregard the kinetic energy of part a? Thank you in advance!