Why the kinetic energy of the emitted electrons varies up to a maximum value?

Answer 1

Let the work function of a metal be W. Let C be a constant of the dimension of energy.

if Kis the maximum kinetic energy of an electron then.......W=C-K.....

(K HERE IS THE ENERGY SUPLIED BY A PHOTON TO THE ELECTRON)

Answer 2

The kinetic energy of an emitted electron must be less than hf-φ. An electron uses energy to reach the surface of the metal. KE= hf - φ A certain amount of energy is required by a photoelectron.

Answer 3

The kinetic energy of emitted electrons varies up to a maximum value because the energy required to remove an electron from an atom depends on the frequency of the incident radiation. If the frequency of the radiation is below a certain threshold, no electrons are emitted. As the frequency increases, the kinetic energy of the emitted electrons also increases up to a maximum value determined by the frequency of the radiation.