If an electron is revolving in its Bohr orbit having Bohr radius of 0.529$\mathop A\limits^o $, then the radius of third orbit is

Question

4496$\mathop A\limits^o $

4.761$\mathop A\limits^o $

$5125 \mathrm{~nm}$

$4234 \mathrm{~nm}$

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