The Emission spectrum can be separated into three types:
A gas of hydrogen atoms will create an absorption line spectrum if it is between you (telescope+spectrograph) and a continuum light source, and also an emission line spectrum if considered from a distinguishable angle.
When The emission spectrum of atomic hydrogen has been divided into several spectral sequences, with wavelengths given by the Rydberg formula.
These experimental spectral lines are due to the electron-making transitions between two energy positions in an atom.
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