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The SI unit of work function of a metal used in photoelectric effect is
By BYJU'S Exam Prep
Updated on: September 25th, 2023
(a) joule (J)
(b) newton (N)
(c) pascal (Pa)
(d) hertz (Hz)
The SI unit of the work function of a metal used in photoelectric effect is joule (J). Work function is defined as when light is incident on a metal surface, it takes the absolute minimal amount of energy to trigger photo-emission of electrons from the metal surface.
Table of content
SI Unit of Work Function
- The threshold energy is another name for the work function.
- The work function and the photoelectron kinetic energy are added together to form the energy of the incident light.
- Therefore, the work function plus the electron’s maximal kinetic energy equals the total energy of a photon.
- The energy of a photon is given by the equation: E = hν Where ν is the frequency of incident light and h is Planck’s constant.
- The work function is a measure of energy. All forms of energy have the same SI unit i.e. joule (J).
Summary:
The SI unit of the work function of a metal used in photoelectric effect is (a) joule (J) (b) newton (N) (c) pascal (Pa) (d) hertz (Hz)
Joule (J) is the SI unit of the work function of a metal used in the photoelectric effect. It is the minimum thermodynamic work required for removing an electron from solid to vacuum immediately outside the solid surface.
