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λ for one line of the hydrogen spectrum is .4118 x 10-4 cm. Use this value in the Rydberg equation to calculate the RH value using n1 = 2, and n2 = 5.

I am not certain of your difficulty here. Can you amplify?

How did you make the symbol for lamda?
(1/lambda) = R(1/n1^2 - 1/n2^2)
Just substitute and solve for R. Use lambda in meters. Post your work if you get stuck. R = 1.0973732 x 10^7 m^-1 if you want to check your answer.

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