The radius of the first excited state of a Helium ion $(He^+)$ is given by (where $a_0$ is the radius of the first stationary state of the hydrogen atom):
- A$r = \frac{a_0}{2}$
- B$r = \frac{a_0}{4}$
- C$r = 4 a_0$
- D$r = 2 a_0$
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