As the electron collides, it transfers all its energy to the hydrogen atom.The excitation energy to raise the electron from the ground state to the nth state is given by: E=(13.6eV)×(121​−n21​) Substituting n=2, we getE=10.2eV Substituting n=3, we getE=12.08eV Thus, the atom will be raised to the second excited energy level.So, when it comes to the ground state, there is transitions from n=3 to n=1.Therefore, the wavelengths emitted will lie in the Lyman series (infrared region).