A) \[12.9\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[3.5\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[9.7\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[6.6\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
\[2\pi {{r}_{n}}=n{{\lambda }_{n}}\] \[{{\lambda }_{3}}=\frac{2\pi (4.65\times {{10}^{-10}})}{3}\] \[{{\lambda }_{3}}=9.7\overset{\text{o}}{\mathop{\text{A}}}\,\]
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