The ratio of speed of an electron in ground state in Bohrs first orbit of hydrogen atom to velocity of light in air is
The ratio of speed of an electron in ground state in Bohrs first orbit of hydrogen atom to velocity of light in air is
- A
$\frac{{{e^2}}}{{2{\varepsilon _0}hc}}$
- B
$\frac{{2{e^2}{\varepsilon _0}}}{{hc}}$
- C
$\frac{{{e^3}}}{{2{\varepsilon _0}hc}}$
- D
$\frac{{2{\varepsilon _0}hc}}{{{e^2}}}$
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