The Work Function Is The Minimum Energy (Usually Measured In Electron Volts) Needed To Remove An Electron From A Solid To A Point Immediately Outside The Solid Surface (Or Energy Needed To Move An Electron From The Fermi Energy Level Into Vacuum).
You might have a read of these: In physics, work is defined as a force causing the movement—or displacement—of an object. For a work to be done, in a scientific sense, a force must be exerted and there must be displacement in the direction of the force.
This Effect Must Be Considered Whenever Connections Are Made Between Dissimilar Metals In Certain Electronic Circuits.
So mean work function is given by: The work function is a fundamental quantity applied to many aspects of physics and describes the minimum energy required to remove an electron from the surface of a metal and eject it into the vacuum. The work function will vary from metal to metal.
Consider The Electrons In A Metal As Trapped Inside An ‘Energy Well’ Where The Energy Between The Surface And The Top Of The Well Is Equal To The Work Function Φ.
Work required to bring an electron from infinity to. Compton effect , this previous answer, work function 1 and this wikipedia article work function 2. One electron volt is the work done when one electron is transferred between points with a potential difference of one volt;
When Metals Of Different Work Functions Are Joined, Electrons Tend To Leave The Metal With The Lower Work Function (Where They Are Less Tightly Bound) And Travel To The Metal Of Higher Work Function.
The amount of work a force does is directly proportional to how far that force moves an object. The temperature range used in the thermionic emission method is often very high (thousands of kelvins), making this method of limited value for studying materials and surfaces which are unstable at high temperatures. It is a shallow donor and has a small formation.
With This Said, We Can Say That.
W = h ν o;. The minimum energy needed to eject an electron from a metal is known as the work function of the metal. Work function is different for different metals.