What minimum frequency of light is required to eject electrons from a surface with a work function of 5.5x10-19J? Show your work. Question 2 (6 points) 2. The maximum kinetic energy of electrons emitted from a tungsten surface is 1.3 eV. The surface has a work function of 3.97 eV and is illuminated by light. Calculate the wavelength of the light. Question 3 (4 points) 3. Light with a frequency of 2. 4 x 1015 Hz is directed at a metallic surface with a work function of 3.63 eV. a) Determine the maximum kinetic energy of the photo-electrons in joules. (rounded to 2 significant digits) Question 4 (3 points) b) Determine the cut-off potential necessary to stop the photo-electrons.

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