In the Bohr model of the hydrogen atom,the centripetal force is provided by the Coulomb attraction between the proton and the electron. If $r_0$ is the radius of the ground state orbit,$m$ is the mass,$e$ is the charge on the electron,and $\varepsilon_0$ is the permittivity of vacuum,the speed of the electron is:

  • A
    zero
  • B
    $\frac{e}{\sqrt{\varepsilon_0 r_0 m}}$
  • C
    $\frac{e}{\sqrt{4 \pi \varepsilon_0 r_0 m}}$
  • D
    $\frac{\sqrt{4 \pi \varepsilon_0 r_0 m}}{e}$

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