Bohr suggested the revolutionary idea that electrons "jump" between energy levels ... in his model lined up with the regular patterns (spectral series) of light emitted by real hydrogen atoms.

5. A hydrogen atom initially at the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of the photon. 6. (a) Using Bohr’s model calculates ...

Bohr suggested the revolutionary idea that electrons "jump" between energy levels ... in his model lined up with the regular patterns (spectral series) of light emitted by real hydrogen atoms.