A) \[2/3\]
B) \[4/9\]
C) \[1/4\]
D) \[16/81\]
Correct Answer: A
Solution :
Radius of half period zone \[r\propto \sqrt{n}\] \[\frac{{{r}_{1}}}{{{r}_{2}}}\,=\sqrt{\frac{4}{9}}\,=\frac{2}{3}\]
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