A) \[9\,\,R\]
B) \[6\,\,R\]
C) \[3\,R\]
D) \[R\]
Correct Answer: A
Solution :
Radius of Bohr's orbit. \[{{R}_{n}}=\frac{{{A}_{0}}{{n}^{2}}}{Z}\] \[\Rightarrow \] \[{{R}_{n}}\propto {{n}^{2}}\] (Z = constant) \[\therefore \] \[{{R}_{3}}={{3}^{2}}R=9R\]
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