(a) Calculate the number of photoelectrons per second ejected from a 1.00-mm² area of sodium metal by 500-nm EM radiation having an intensity of 1.30 kW/m² (the intensity of sunlight above the Earth's atmosphere).

(b) Given that the binding energy is 2.28 eV, what power is carried away by the electrons? 

(c) The electrons carry away less power than brought in by the photons. Where does the other power go? How can it be recovered?