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Give the expression for velocity of an e...

Give the expression for velocity of an electron in the `n^(th)` orbit. Explain the meanings of the symbols.

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`v=(Ze^(2))/(2epsilon_(0)nh)` where Z is the atomic number , e is the qantised unit of charges `n^(th)` is the principle quantum number, h is the Planck constant and `epsilon_(0)` is absolute permittivity of the free space .
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