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

A

$$r_0 = a_0$$

B

$$r_0 = 4a_0$$

C

$$r_0 = \frac{a_0}{2}$$

D

$$r_0 = 2a_0$$