The Work Function Of A Metal Is The Minimum Amount Of Energy Required To Start The Emission Of Electrons From The Metal’s Surface.
Energy) required to remove an electron from a solid to a point in the vacuum immediately outside the solid surface. A photon having an energy at least equal to the work function can eject electron from the metal, frequency of such a photon whose energy is just equal to the work function is called threshold frequency. The value of the work function is equal to the energy of the electron revolving around the nucleus.
The Work Function (Wf) Of A Metal Can Be Defined As The Minimum Energy Required To Extract One Electron From A Metal.
If there is a photocurrent, the work function of the metal must be less than this. The work functions of polycrystalline metals are often used to systematize schottky barrier height data for rectifying contacts to semiconductors. The work function (wf) of a metal can be defined as the minimum energy required to extract one electron from a metal.
First Online 22 February 2006;
The required work functions for nmos and pmos have to be set by careful optimization of thermal treatments or anneals. The presence of minute amounts of The work function of a certian metal is 2.3 ev.if light of wave number 2×106m−1falls on it,the kinetic energies of fastest and slowest ejected electorn will be respectively:
The Magnitude Of The Work Function Is Usually About A Half Of The Ionization Energy Of A Free Atom Of The Metal.
The energy of the photon is 3.54 ev. Φ w < 0, 33. The work function of a metal is the minimum amount of energy that will take out an electron from the orbital of an atom.
It Is Somewhat Higher On Dense Crystal Faces Than Open Ones.
J z = b t 2 e − w k b t. Where w is the work function of the metal, t is the thermodynamic temperature of the metal. The work function of metals is in the range of 2 to 6ev and correlates mainly with the electronegativity of the element (table 1.23).