The energy of an electron in the excited hydrogen atom is $-3.4 \ eV$. Then according to Bohr's theory,the angular momentum of the electron in that excited state is ($h=$ Planck's constant).
- A$\frac{2 \pi}{h}$
- B$\frac{n h}{2 \pi}$
- C$\frac{h}{\pi}$
- D$\frac{3 h}{2 \pi}$
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