How did Bohr use the atomic line spectrum of hydrogen to explain his model of the atom?
The lines of the spectrum represented the different energy levels of the electons.
Bohr based this assumption on the fact that there are only a few lines in the spectrum of the hydrogen atom and he believed that the lines were the result of light being released or absorbed as an electron moved from one orbit to another in the atom.
As the electron moved further away from the nucleus it would become excited as it absorbed light causing the electron to become more charged. As the electron relaxed it would release energy. As the electrons moved in between these lines energy continued to transfer.