Maximum Kinetic Energy And Stopping Potential — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Maximum Kinetic Energy and Stopping Potential Applies to the photoelectric effect experiments where photoelectrons are ejected from a metal surface and stopped by a negative potential. Energy conservation principle is applied to the emitted electron. Work done by the electric field (W = qV) to stop the electron is equated to its initial kinetic energy. At stopping potential V0, the kinetic energy of the fastest electron is reduced to zero: K max - eV0 = 0. Neglects thermal energy of electrons before emission Assumes a vacuum environment to prevent electron collisions Applicable only for the electrons with the highest kinetic energy Stopping potential depends on light intensity (it actually depends only on light frequency and material properties). All photoelectrons have energy equal to K max (K max is only the upper limit of the energy distribution).