Question

how did this theory justify the origin of spectral lines in hydrogen?​

Answer 1

Niels Bohr explained the line spectrum of the hydrogen atom by assuming that the electron moved in circular orbits and that orbits with only certain radii were allowed.

This produces an absorption spectrum, which has dark lines in the same position as the bright lines in the emission spectrum of an element.

Answer 2

Explanation:

Niels Bohr explained the line spectrum of the hydrogen atom by assuming that the electron moved in circular orbits and that orbits with only certain radii were allowed. ... The orbit closest to the nucleus represented the ground state of the atom and was most stable; orbits farther away were higher-energy excited states.

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