A) \[0.529\overset{o}{\mathop{\text{A}}}\,\]
B) 3.125\[\overset{o}{\mathop{\text{A}}}\,\]
C) 2.1165\[\overset{o}{\mathop{\text{A}}}\,\]
D) 4.2\[\overset{o}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
\[{{r}_{n}}=\frac{0.529{{n}^{2}}}{Z}\overset{o}{\mathop{\text{A}}}\,\] \[=\frac{0.529{{(2)}^{2}}}{1}\] \[=0.529\times 4=2.116\overset{o}{\mathop{\text{A}}}\,\]
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