The wave function (Ψ) of 2 s is given by Ψ_2 s =1/(2 √(2 π))(1/a_0)^1 / 2(2-r/a_0) e^-r / 2 a_0 At r=r_0, radial node is formed. Thus, r_0 in terms…

The wave function $\displaystyle (\Psi)$ of $\displaystyle 2$ s is given by $$\Psi_{2 \mathrm{~s}}=\frac{1}{2 \sqrt{2 \pi}}\left(\frac{1}{a_0}\right)^{1 / 2}\left(2-\frac{r}{a_0}\right) e^{-r / 2 a_0} $$ At $\displaystyle r=r_0$, radial node is formed. Thus, $\displaystyle r_0$ in terms of $\displaystyle a_0$