7. Suppose light with total intensity 2 W/cm falls on a metal sample with an area of 2 cm. a) The metal reflects 96% of the incoming light. For the light that is absorbed, only 3% has enough energy to eject electrons from the metal. Determine the intensity of light that is actually available for the photoelectric effect. b) Suppose that each photon with enough energy to eject an electron has a wavelength of approximately 250 nm. If each of these photons successfully ejects an electron, what is the photoelectric current (charge per unit time) from the metal sample? Although electrons are negatively charged just give the magnitude (absolute value) of the current. c) If the threshold frequency is 1.1 1015 Hz what is the work function of the metal? Express your answer in units of eV. d) What is the stopping voltage when using photons with a wavelength of 250 nm?