ultraviolet light is incident normally on the surface of a certain substance.the work function of the electron in this substance is 3.44ev.the incident light has an intensity of 0.055 W/m2. The electrons are photo electrically emitted with a maximum speed of 4.2*10^5m/s.what is the maximum number of electrons emitted from a square centimeter of the surface per second? preferred that none of the photons are reflected or heat the surface?

ultraviolet light is incident normally on the surface of a certain substance.the work function of the electron in this substance is 3.44ev.the incident light has an intensity of 0.055 W/m2. The electrons are photo electrically emitted with a maximum speed of 4.2*10^5m/s.what is the maximum number of electrons emitted from a square centimeter of the surface per second? preferred that none of the photons are reflected or heat the surface?