Question: A student performs the photoelectric effect experiment and obtains the data depicted in the accompanying graph of E_{km} (maximum kinetic energy) of photoelectrons v. the frequency of the photons. What is the approximate work function of this material? A) 1.5 eV  B) 2.0 eV  C) 2.7 eV  D) 3.5 eV. Please choose an answer from [A, B, C, D].
Answer: A