In the first excited state of hydrogen atom, the energy of its electron is –3.4 eV. The radial distance of the electron …

In the first excited state of hydrogen atom, the energy of its electron is –3.4 eV. The radial distance of the electron from the hydrogen nucleus in this case is approximately :

(Take 1 eV = 1.6 × 10^–19 J, e = 1.6 × 10^–19 C and \(\frac{1}{4\pi {\epsilon }_{0}}\) = 9 × 10⁹ N m²/C²)