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Q.

If R is the Rydberg constant for hydrogen, then the wave number of the first line in the Lyman series is

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a

$\frac{R}{2}$

b

$2 R$

c

$\frac{R}{4}$

d

$\frac{3 R}{4}$

answer is D.

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Detailed Solution

$\bar{ϑ} = \frac{1}{λ} = R [\frac{1}{1^{2}} - \frac{1}{2^{2}}] = \frac{3 R}{4}$

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