Photoelectric effect . What happens to the kinetic energy of the electrons as the intensity of the incident radiation increases?
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In the photoelectric effect, some an incident photon's energy is used to remove an electron from the metal, while the remainder
becomes the electron's kinetic energy. The energy required to remove the electron from the metal is called the work function of the metal, and it is a constant for a given material. The stopping potential is the electric potential needed for an electron at rest to have as much electric potential energy as the kinetic energy of the electron ejected from the metal.
If the intensity of the incident light is increased, but its frequency is kept constant, the number of photons striking the metal per unit time increases, but the energy of individual incident photons remains constant.