Which series is found in the visible light region?

Which of the following is true for the number of spectral lines when going from the Lyman series to the Pfund series?

$A$ hydrogen atom in its ground state absorbs a photon and the electron transitions to the $5^{th}$ orbit. When the excited atom returns to its ground state,it emits photons of various energies. What is the maximum number of spectral lines that can be obtained in this process?

The wavelength of the first spectral line of the Lyman series of the hydrogen spectrum is

When an electron in a hydrogen atom jumps to the innermost orbit,the radiation emitted belongs to which one of the following series?

The first line in the Lyman series has wavelength $\lambda$. The wavelength of the first line in the Balmer series is