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Why does hydrogen have 4 lines in the atomic spectroscopy and not more?

I mean when an electron get excited it has more than 4 possible ways to return to the ground state. So why we see only 4 lines?

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The electron can emit radiations in different frequency ranges. They are the Lyman, Ballmer, Paschen, Brackett, Pfund, Humphrey series and other series for n>6. They correspond to the de-excitation of electrons to n= 1,2,3,4,5 and 6 respectively. Lyman series is in the ultraviolet range, Balmer series in the visible range and Paschen, Brackett and Pfund series in the infrared region.

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