The number of possible lines of Paschen series when an electron jumps from the $7^{th}$ excited state to the ground state in a hydrogen like atom is:

Q. The number of possible lines of Paschen series when an electron jumps from the $7^{th}$ excited state to the ground state in a hydrogen like atom is:

Q. which an electron in hydrogen atom jumps from the third excited state to the ground state

Q. Find the number of spectral line in Paschen series emitted by atomic $H$, when electron excited from ground state to ${70}^{th}$ energy level return back.

Q. STATEMENT - 1 : In the duration electron jumps from first excited state to ground state in a stationary isolated hydrogen atom, the angular momentum of the electron about the nucleus is conserved.

Q. The ionisation energy of a hydrogen like Bohr atom is $4$ Rydberg.
What is the wavelength of the radiation emitted when the electron jumps from the first excited state to the ground state?