Which metal has highest work function?
The highest known metal work function is approximately 6.35 eV for platinum (Pt) and lowest work function is 2.14eV for cesium. Work function can be said as the minimum energy needed to move an electron from the Fermi level into vacuum.
What is the work function for metals?
The work function of a metal is 1.5 eV.
What’s the work function of zinc?
4.3
Work Functions for Photoelectric Effect
| Element | Work Function(eV) |
|---|---|
| Silver | 4.26-4.73* |
| Sodium | 2.28, 2.36** |
| Uranium | 3.6 |
| Zinc | 4.3 |
What is Platinum threshold frequency?
The threshold frequency for photoelectric emission of electrons from platinum is 1.3 × 10^15 s^-1 .
What is the lowest work function?
The lowest work function of materials reported so far is in a range of about 1 eV. Here, to design low work function materials, we perform first-principles calculations on selected materials of transition metal dichalcogenide as substrates and alkali metals as adsorbates.
What is work function of a metal Class 12?
The work function of a given metal can be defined as the amount of energy which is required to pull out an electron from an atom. This energy is equal to the energy of the electron revolving around the nucleus. In photoelectric effect, we shine a light of certain frequency on a metal.
What is a work function in chemistry?
(noun) The minimum energy needed to remove an electron from the surface of a material.
What is the formula for work function of a metal?
Their formula is W=−ϵF+Ws, where ϵF is the Fermi energy, a quantity determined by the density of electrons and the properties of the crystal lattice of the metal; you can work out reasonable approximations to this for alkali metals by using the free electron approximation.
What is the work function for silver?
The work function depends on the configurations of atoms at the surface of the material. For example, on polycrystalline silver the work function is 4.26 eV, but on silver crystals it varies for different crystal faces as (100) face: 4.64 eV, (110) face: 4.52 eV, (111) face: 4.74 eV.