3. (14 points) The graph below shows the kinetic energy of ejected electrons as a function of wavelength for three different metals (A, B, and C). B Threshold frequency (MHz) A. KE of ejected electrons B. 365 423 632 Wavelength of Radiation (nm) a) (6) Calculate the threshold frequency of each metal in units of MHz. (Show one complete calculation below and enter the threshold frequencies for all three metals in the table above.) b) (3) Each metal is exposed to a photon with a frequency of 3.50 x 1014 s-1. Which (if any) of the metals will exhibit the photoelectric effect? Show work below and check all that apply in the list (left). Work: Metal A Metal B Metal C None of these metals-II J. What *2) (5) Metal A is EXposed to a photon of UV light with an energy of L643 " 1" is the kinetic energy of [he ejected electron