The energy (in $eV$) associated with the electron in the $1^{st}$ orbit of $Li^{2+}$ is

The energy required for the ionization of an excited hydrogen atom would be (in $eV$)-

The energy of the first (lowest) Balmer line of the $H$ atom is $x \ J$. The energy (in $J$) of the second Balmer line of the $H$ atom is:

Explain linear and angular momentum.

What will be the frequency of the radiation emitted when an electron in a hydrogen atom jumps from $n = 4$ to $n = 1$? $(h = 6.625 \times 10^{-34} \,J \cdot s)$

For a hydrogen atom,the energy of the $n^{th}$ orbit is given by the equation $E \propto n^y$. What is the value of $y$?