Balmer series was observed and analysed before the other series. Can you suggest a reason for such an order?

Which wavelengths will be emitted by a sample atomic hydrogen gas (in ground state) if electrons energy 12.2 eV collide with the atoms of the gas?

When white radiation is passed through a sample hydrogen gas at room temperature, absorption lines an observed in Lyman series only. Explain.

What will be the energy corresponding to the first excited state of a hydrogen atom if the potential energy of the atom is taken to be 10 eV when the electron is widely separated from the proton? Can we still write E_n = E_i/n², or r_n = a₀ n² ?

The difference in the frequencies of series limit of Lyman series and Balmer series is equal to the frequency of the first line of the Lyman series. Explain.