Question

In terms of rydberg constant R, the wave number of 2nd lyman line is 1)3R 2)R 3)5R/36 4)8/9R​

Answer 1

Answer: 4 (8/9R)

Explanation:

2nd Lyman line comes from pashchan series that is n=3

So

1/Wavelength = R (1/1^2 - 1/3^2)

1/Wavelength = R (1/1-1/9)

Wavenumber = 8R/9