In an advanced laboratory class a student performs the photoelectric experiment. Ultraviolet light is shone on a particular metal and the stopping potential is measured at the same time. It is found that 3.40 V is needed to stop all the electrons when the wavelength of the light is 276 nm, and 4.20 V for a wavelength of 242 nm. What is the work function of the metal? 2.25 ev You are correct. Your receipt no. is 153-9827 @ Previous Tries What is Planck's constant based on this measurement? Hint: What is the unit of Planck's constant, if you use electron-volts instead of joules? Submit Answer Incompatible units. No conversion found between "A" and the required units. @ Tries 2/12 Previous Tries