Answer to Question #34956 in Electric Circuits for jarden jerome

Question

in a photo electric setup, a point source of light of power 3.3*10^-3W emits mono energetic photons of energy 4.5eV. the source is located at a distance of 750mm from the center of a stationary metallic sphere of work function 3.1eV and of radius 7.8cm. the efficiency of photo electron emission is one foe ever 10^5 incident photons. assume that the sphere is isolated and initially neutral and that photo electrons are instantly swept away after emission. calculate the number of photo electrons emitted per second