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In the Bohr model of hydrogen atom, the ...

In the Bohr model of hydrogen atom, the centripetal force is furnished by the Coulomb attraction between the proton the electro. If `a_0` is the ground state orbit, `m` is the mass, `e` is the charge on the electron, `in_0` is the vacuum perimittivity, then the speed or electron is

A

`sqrt(in_0a_0m)/e`

B

`e/sqrt(in_0a_0m)`

C

`sqrt(4 pi in_0a_0m)/e`

D

`e/sqrt(4 pi in_0a_0m)`.

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