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The radius of the an orbit of Be^(+3) io...

The radius of the an orbit of `Be^(+3)` ion is 0.529Å. The velocity of electron in this orbit will be

A

`0.545xx10^6` m/s

B

`2.18xx10^6` m/s

C

`4.36xx10^6` m/s

D

`1.09xx10^6` m/s

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