Rydberg formula for Hydrogen-like elements

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The energy differences between levels in the Bohr model, and the wavelengths of emitted/absorbed photons, is given by the Rydberg formula:

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R: Rydberg’s constant for the element

Z: Atomic number of the element

n1, n2: principal quantum numbers of the orbitals occupied before and after the quantum leap (n1<n2).