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Updated March 09, 2023
  photoelectric effect

Image: 10-14 meters or 10 fermi is the size of the nucleus of an atom. Towards the end of the 19th century, it was discovered that the atom was not an indivisible element of matter.
E = hf - Φ, where E is the kinetic energy of the emitted electron, h is Planck's constant, f is the frequency of the incident light and Φ is the work function of the material which depends on the properties of the material.
The Nobel Prize in Physics was awarded to Einstein in 1921 for this explanation of the photoelectric effect.

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