What is the physical significance of the lines in the following depletion of atomic orbital pls ans soon.

Dear Student,

As the figure is missing and answered generally based on assumptions,

The lines mentioned in atomic orbitals mention the radii of the orbital distance which helps in identifying the number of the orbitals which are used in computation of the energy E_n., the mathematical expression for computation are expressed.​The lines are used in computing n-orbitals as below,

$$\begin{gathered} r_n=n^2{a}_o \\ where a_{o }is associated with lines, \\ n=\sqrt{\frac{r_n}{a_o}} \end{gathered}$$

using n the energy are calculated,

$E_n=\frac{-13.6 eV}{n^2}$
Regards.