A) \[1215.4\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[2500\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[7500\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[600\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: A
Solution :
Ratio of wavelengths of 1st line of Balmer and Lyman series \[\frac{{{\lambda }_{Lyman}}}{{{\lambda }_{Balmer}}}=\frac{\left( \frac{1}{{{2}^{2}}}-\frac{1}{{{3}^{2}}} \right)}{\left( \frac{1}{{{1}^{2}}}-\frac{1}{{{2}^{2}}} \right)}\] \[{{\lambda }_{Lyman}}=1215.4\overset{\text{o}}{\mathop{\text{A}}}\,\]
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