Sodium, Potassium, Cesium And Calcium All Have Work Functions Under 2.9 Ev.
Using this wavelength in the planck relationship gives a photon energy of 1.82 ev. You can do some fancy surface chemistry to change the aluminum (for example) and alter its crystallinity at the surface, but it won't alter the work function substantially. Element work function(ev) aluminum 4.08.
Calculate The Work Function For Each Of The Metals In [J] And [Ev] Using The Previously Determined Threshold Frequencies.
H f = kemax + wo Where h is planck’s constant, v is the frequency of the radiation and p the work function, the energy needed to escape the surface of the body. If an electron in a metal is at the fermi level e f of energy in a metal, then a certain amount of energy is required for the electron to just escape from the metal, and this energy is referred to as the work function φ of the metal.
1.7 The Minimum Amount Of Energy Required For An Electron To Escape From A Metal Is Called The Work Function W, And Is Given By, W = Hf.
Work function measurements are very sensitive to surface cleanliness as well as crystal orientation. Materials are often measured “as received” and then after “ion etching” to remove surface contamination. These values do not change substantially by heating and ar ion sputtering.
Only Sodiums Work Function Is Less Than The Energy Of The Photon.
Photoelectricphotoelectric effecteffect each metal has a minimum energy neededeach metal has a minimum energy needed for an electron to be emitted.for an electron to be emitted. Here is a particular study for a particular problem of the work function of silver: A decrease of this parameter of about 0.2 0.3 ev is observed when the cathode temperature reaches 700 k, independently of the nature of the material.
The Atomic Concentrations Of Each Element In Ito, Measured With Xps, Are Also Quite Stable Under Heat Treatment And Ion Sputtering.
Based on hyperphysics.edu the work function that i calculated for the mystery element best pairs with magnesium. Hyperphysics is an exploration environment for concepts in physics which employs concept maps and other linking strategies to facilitate smooth navigation. These electrons will leave with the greatest kinetic energy kemax which is given by.