A) \[\frac{R}{4}\]
B) \[\frac{3R}{4}\]
C) \[\frac{R}{2}\]
D) \[2R\]
Correct Answer: B
Solution :
The wave number in Lyman series is \[=R\left[ \frac{1}{{{1}^{2}}}-\frac{1}{{{(n)}^{2}}} \right]\] Hence, the wave number of first time when n = 2 is \[=R\left( \frac{1}{{{1}^{2}}}-\frac{1}{{{2}^{2}}} \right)=R\times \frac{3}{4}=\frac{3R}{4}\]
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