Niels Bohr developed a theory that accounted for the lines in the visible region of the hydrogen spectrum.

Name: Niels Bohr developed a theory that accounted for the lines in the visible region of the hydrogen spectrum.
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Niels Bohr's theory, introduced in 1913, explained the discrete lines in the hydrogen spectrum by proposing that electrons orbit the nucleus in certain allowed paths without radiating energy, and light is emitted or absorbed when an electron moves from one orbit to another.

Niels Bohr Developed a Theory That Accounted for the Lines