Energy of an electron in the second orbit of a hydrogen atom is $E$. The energy of an electron $E_3$ in the third orbit of a helium $(He^+)$ ion will be:
- A$E_3 = \frac{4E}{9}$
- B$E_3 = \frac{16E}{3}$
- C$E_3 = \frac{16E}{9}$
- D$E_3 = \frac{4E}{3}$
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