What is the velocity of electrons in'the...

What is the velocity of electrons in'the first Bohr Orbit of Hydrogen atom:

`3xx10^8m//s`

`2.19xx10^6m//s`

`3xx10^7m//s`

`2.19xx10^7m//s`

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If the velocity of an electron in the Bohr first orbit of hydrogen atom is x, then find the velocity of the electron in the third Bohr's orbit.

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