A) \[825\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[900\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[1215\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1325\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
For Lyman series, \[\frac{1}{\lambda }=R\left( \frac{1}{{{1}^{2}}}-\frac{1}{{{n}^{2}}} \right)\] \[\frac{{{\lambda }_{1}}}{{{\lambda }_{2}}}=\frac{\left( \frac{1}{{{1}^{2}}}-\frac{1}{{{3}^{2}}} \right)}{\left( \frac{1}{{{1}^{2}}}-\frac{1}{{{2}^{2}}} \right)}\] \[n=2,3,4.......\] For 1st line \[n=2\], for IInd line \[n=3\] \[{{\lambda }_{1}}=1215\overset{\text{o}}{\mathop{\text{A}}}\,\]
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