Question

Find the value of energy of electron in eV in the third Bohr orbit of hydrogen atom.
(Rydberg's constant $\left(R\right)=1.097\times {10}^7{m}^{-1}$
Planck's constant $\left(h\right)=6.63\times {10}^{-34}J-s$,
Velocity of light in air $\left(c\right)=3\times {10}^{8}m/s$).

Answer 1

Energy of electron in nth Bohr orbit of H-atom $E_n=\frac{-13.6}{n^2}$ eV

Electron energy in third orbit, $E_3=\frac{-13.6}{3^2}=-1.51$ eV