فراوس ِ سوم ِ بؤر farâvas-e sevom-e Bohr
*Fr.: troisième postulat de Bohr*
One of the postulates used in the → *Bohr model*, whereby the
atom emits (absorbs) a quantum of electromagnetic energy
(→ *photon*) when the electron
passes from an orbit with a greater (lesser) *n* value to one with a lesser
(greater) value. The energy of the quantum is equal to the difference
between the energies of the electron on its orbits before and after the transition
or "jump": *h*ν = ε_{1} - ε_{2}, where
*h* is the → *Planck's constant* and ν the
frequency of the transition. → *Bohr*; → *third*;
→ *postulate*. |