Section-C: Comprehension Type
In a photoelectric effect set up, a point source of light of power 3.2 × 10−3 W emits monoenergetic photons of energy 5eV. The source is located at a distance of 0.8 from the centre of a stationary metallic sphere of work function 3eV and radius 8 × 10−3m. The efficiency of photoelectron emissions is one for every 106 incident photons. Assume that the sphere is located and initially neutral and the photo electrons are initially swept away after emission.
Find the number of photons emitted per second :