At what minimum value of the energy of electrons colliding with hydrogen atoms can the appearance of all possible lines

At what minimum value of the energy of electrons colliding with hydrogen atoms can the appearance of all possible lines in the hydrogen spectrum be observed?

At an energy equal to the ionization energy of the hydrogen atom: E = 13.6 eV.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.