A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. How many spectral lines will be emitted and to which series do they belong?

Ionisation potential of Hydrogen atom is 13.6 eV. Hydrogen atom in the ground state are excited by monochromatic light of energy 12.1 eV. The spectral lines emitted by hydrogen according to Bohr's theory will be:

The ionisation energy of hydrogen atom is 13.6 eV. The hydrogen atom in the ground state is excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory the number of spectral lines emitted are