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What is the velocity of electron in seco...

What is the velocity of electron in second orbital of `He^(+)` ion.

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`V=(2pi^(2)Kme^(2))/(h).z/n`
`V=2.18xx10^(6)xxz/n`
`V=2.18xx10^(6)xx2/2=2.18xx10^(6)m//sec`
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