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The velocity of an electron in its fifth orbit, if the velocity of an electron in the second orbit of sodium atom (atomic number = 11) is $v$ , will be :

A. $v$

B. $\frac{22}{5} v$

C. $\frac{5}{2} v$

D. $\frac{2}{5} v$

Correct Answer :

D. $\frac{2}{5} v$

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