What is the formula for work function?
In equation form, this is given by KEe = hf − BE, where KEe is the maximum kinetic energy of the ejected electron, hf is the photon’s energy, and BE is the binding energy of the electron to the particular material. (BE is sometimes called the work function of the material.)
How do you determine the work function of a material?
Work function measurement techniques: The work function of a material can be measured with PES and Kelvin probe (KP). While PES allows the measurement of the absolute work function, KP only gives the contact potential difference (CPD) between the actual probe and the sample surface.
Is binding energy the same as work function?
Electrons are bound to the metal by a binding energy we call the work function, Wo, which differs from metal to metal. If the photon energy is less than the work function, no electrons are emitted.
What is the work function of sodium in joules?
The work function of sodium metal is 4.41xx10^(-19)J.
What is the relation between work function and threshold wavelength?
If the incoming radiation has an energy equal to the work function of the metal then the frequency of the radiation is known as threshold frequency. The relationship between frequency and wavelength is given as $psilon = \dfrac{c}{\lambda }$ , where c is the speed of light and $\lambda $ is the wavelength.
How is UPS work function calculated?
calculate WF by simply subtract the binding energy of the secondary region from the total energy of the incident light：WF =hv − ESE，however others subtract by the width of the binding energy from onset of the secondary electrons up to the Fermi edge.
What is the difference between binding energy and work function?
While the workfunctions and ionization energies appear as similar concepts, they are independent. The workfunction of a metal is the minimum amount of energy (E) necessary to remove an electron from the surface of the bulk (solid) metal (sometimes referred to as binding energy).
How do you find the threshold wavelength of a work function?
Given: Work function of platinum = Φ = 6.3 eV =6.3 x 1.6 x 10-19 J, Threshold wavelength of silver = 1972 Å = 1972 x 10-10 m, speed of light = c = 3 x 108 m/s, To Find: Planck’s constant = h =? Example – 10: The photoelectric work function of metal is 1.32 eV.