The ratio of the speed of an electron in the ground state of the Bohr's first orbit of a hydrogen atom to the velocity of light in air is:
- A$\frac{e^2}{2\varepsilon_0 hc}$
- B$\frac{2e^2\varepsilon_0}{hc}$
- C$\frac{e^3}{2\varepsilon_0 hc}$
- D$\frac{2\varepsilon_0 hc}{e^2}$
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