The energy of an electron in the fourth excited state of the hydrogen atom is

$A$ free electron of $2.6 \, eV$ energy collides with a $H^+$ ion. This results in the formation of a hydrogen atom in the first excited state and a photon is released. Find the frequency of the emitted photon. $(h = 6.6 \times 10^{-34} \, J \cdot s)$

Explain emission lines and absorption lines.

The ionization energy of the hydrogen atom is $13.6 \ eV$. The potential energy of the electron in $n=2$ state of the hydrogen atom is

Which fact indicates that the total energy of an electron in an atom is negative?

If $n$ is the orbit number of the electron in a hydrogen atom,the correct statement among the following is