The energy of hydrogen atom in $n^{th}$ orbit is $E_n$, then the energy in $n^{th}$ orbit of singly ionised helium atom will be
$X$-rays incident on a material
Explain the formulas of energy of electron in atom revolving around the nucleus in different orbits.
If radiation of allow wavelengths from ultraviolet to infrared is passed through hydrogen agas at room temperature, absorption lines will be observed in the :
For principal quantum number $n = 3$, the possible values of orbital quantum number $‘l’$ are