 Sommerfeld–Kossel displacement law

The Sommerfeld–Kossel displacement law is important in the field of atomic physics and was proposed by Arnold Sommerfeld and Friedrich Kossel. It describes the behavior of electrons in atomic systems, particularly in relation to electron transitions and the emission or absorption of photons when electrons occupy different energy levels. In essence, the law states that the amount of energy absorbed or emitted by an atom when an electron transitions between two energy levels is proportional to the difference in energy between those levels.