Assuming Rydberg’s constant (RH) to be 1...

Assuming Rydberg’s constant (`R_H`) to be 109670 `cm^(–1)`, the longest wavelength line in the Lyman series of the hydrogen spectrum (in Å) is:

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`1/lambda=R_H Z^2 (1/n_1^2 -1/n_2^2) = 109670(1/1-1/4)=3/4(109670)cm^(-1)`
`lambda=1215.77xx10^(-8)` cm i.e., `lambda` =1215.77 Å

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