A hydrogen atom in the `4th` excited state, then:

A gaseous mixture contains hydrogen atoms in the 4^(th) excited state, He^(+) ions in 3^(rd) excited state and Li^(2+) in 2^(nd) excited state. The number of spectral lines obtained in the emission spectrum of this sample when all these atoms/ions return to the ground state is

A hydrogen atom is in 5^("th") excited state. When the electron jumps to ground state the velocity of recoiling hydrogen atom is "…................" m//s

The ratio of energies of hydrogen atom in its first excited state to third excited state is

The ratio of energies of hydrogen atom in its first excited state to third excited state is

The ratio of energies of hydrogen atom in its first excited state to third excited state is

The energy required to excite an electron from the ground state of hydrogen atom to the first excited state, is