What is the work function of sodium?

Work Functions for Photoelectric Effect
ElementWork Function(eV)
Platinum6.35
Selenium5.11
Silver4.26-4.73*
Sodium2.28
A.

What is photo electric work function?

Early Photoelectric Effect Data. The minimum energy required to eject an electron from the surface is called the photoelectric work function. The threshold for this element corresponds to a wavelength of 683 nm. Using this wavelength in the Planck relationship gives a photon energy of 1.82 eV.
  • What does the work function represent?

    Work function. From Wikipedia, the free encyclopedia. In solid-state physics, the work setting (sometimes spelled workfunction) is the minimum thermodynamic work (i.e. energy) needed to remove an electron from a solid to a point in the vacuum immediately outside the solid surface.
  • What is the work function of tungsten?

    The work function of tungsten is 4.50 eV. Calculate the speed of the fastest electrons ejected from a tungsten surface when light whose photon energy is 5.64 eV shines on the surface (answer in km/s).
  • What is the threshold frequency of sodium?

    A photon has a frequency of 5.2 × 1014 Hz. Calculate the energy of the photon. The work function of sodium metal is 3.6 × 10-19J. The minimum (threshold) frequency is 5.43 × 1014Hz.
B.

Why does the work function differ for different metals?

Different metals have different values of work function because of difference in their electronegativity. Work function is that amount of energy required to get an electron out of the metal plate without any kinetic energy.
  • Why do electrons have a range of kinetic energies up to a maximum value?

    So the maximum energy a photoelectron can have is that given to it by the photon, less the work function. Electrons coming from deeper inside the metal will be emitted with less kinetic energy than those that were already at the surface. Main points: incident photon has fixed energy because the source is monochromatic.
  • Can you convert energy into matter?

    This isn't the first time light has been converted into matter: in 1997, Stanford's linear collider used a different process that involved large numbers of photons interacting with the help of a high-powered electron beam and an electric field that provided the energy needed to collide the photons to produce matter
  • Can a photon be destroyed?

    Photons are not indestructible. They can be destroyed, as they undergo 'absorption' when traveling through matter. A photon is basically, a quantum of electromagnetic energy. In the process of absorption, one or more photons can be absorbed by nuclear particles or atoms, and basically get destroyed.
C.

What are the units of the work function?

h = the Plank constant 6.63 x 10-34 J s. f = the frequency of the incident light in hertz (Hz) &phi = the work function in joules (J) Ek = the maximum kinetic energy of the emitted electrons in joules (J)
  • What is a photoelectric work function?

    Early Photoelectric Effect Data. The minimum energy required to eject an electron from the surface is called the photoelectric work function. The threshold for this element corresponds to a wavelength of 683 nm. Using this wavelength in the Planck relationship gives a photon energy of 1.82 eV.
  • What is the work function of tungsten?

    The work function of tungsten is 4.50 eV. Calculate the speed of the fastest electrons ejected from a tungsten surface when light whose photon energy is 5.64 eV shines on the surface (answer in km/s).
  • What is the meaning of threshold energy?

    In particle physics, the threshold energy for production of a particle is the minimum kinetic energy a pair of traveling particles must have when they collide. The threshold energy is always greater than or equal to the rest energy of the desired particle.

Updated: 6th October 2019

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