The wave function \( (\psi) \) of \( 2s \) is given by:\( \psi_{2s}=\dfrac{1}{2\sqrt{2\pi}}\left(\dfrac{1}{a_0}\right)^{1/2}\left(2-\dfrac{r}{a_0}\right)e^{-r/2a_0} \)At \( r=r_0 \), radial node is formed. Thus, \( r_0 \) in terms of \( a_0 \)
\( r_0 = 4a_0 \)
\( r_0 = 2a_0 \)
\( r_0 = \dfrac{a_0}{2} \)
\( r_0 = a_0 \)
