wave- (I) In photoemission experiment, one can estimate the work function i.e., the minimum energy needed to remove an electron. Each incoming photon can knock-out a single electron and the total energy deposited on the sample is just the number of photons time the energy of the single photon. If the "quantum efficiency" of photoemission is 100% each photon knocks-out a single electron. A) Consider the sodium cathode irradiated by monochromatic ultraviolet light with wa length = 300 nm. The emitted electrons have de Broglie wavelength of 9 x 10-10m. What is the workfunction of Na in eV units (1 eV = 1.602176565(35)x10-19 J). Elec- tronvolt (eV) is a standard unit of energy for quantum mechanics and corresponds to the energy gained by the charge of a single electron moved across an electric potential difference of one volt. B) What is the maximum number of electrons that can be emitted if a potassium surface with work function of 2.40 eV absorbs 7.75 x 10-3 J of radiation at a wavelength of = 275 nm? What is the kinetic energy and velocity of the electron emitted