On a Theory of Line Spectra

The phenomena of line-spectra have been explained in the older quantum theory on the basis of Bohr's hypothesis

hv = E₁ - E₂ … … (1)

supported by other assumptions to bring in quantum numbers. The quantity V represented the frequency of the emitted radiation and was, according to the theory, unconnected with the motion of the electron although the latter is instrumental in giving rise to the radiation.