A) \[0.13{AA}\]
B) \[1.06{AA}\]
C) \[4.77{AA}\]
D) \[2.12{AA}\]
Correct Answer: D
Solution :
\[{{\text{I}}^{\text{st}}}\]excited state means \[n=2\] \[r={{r}_{0}}\times {{2}^{2}}\] \[=0.53\times 4\] \[=2.12\,\text{{ }\!\!\mathrm{AA}\!\!\text{ }}\]
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