The energy required to remove an electron in a hydrogen atom from $n = 10$ state is (in $\text{ eV}$)

Out of the following transitions in a hydrogen atom,identify the transition which emits photons of highest frequency.

The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g.,line no. $5$ arises from the transition from level $B$ to $A$). Which of the following spectral lines will also occur in the absorption spectrum?

The first excited state of a hydrogen atom is $10.2 \ eV$ above the ground state. What temperature is needed to excite a hydrogen atom to its first excited state?

The binding energy of an electron in a $H$-atom with $n = 4$ is ....... $eV$. (Magnitude only)

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