Which will be the first emission line in the | vedclass

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(B) The infrared region of the hydrogen spectrum corresponds to the Paschen series,Brackett series,and Pfund series. The first emission line in the in

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$7R/144 \ cm^{-1}$

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(B) The infrared region of the hydrogen spectrum corresponds to the Paschen series,Brackett series,and Pfund series. The first emission line in the infrared region is the first line of the Paschen series.For the Paschen series,$n_1 = 3$ and for the first line,$n_2 = 4$.The Rydberg formula is given by: $\bar{
u} = R 	imes Z^2 	imes (\frac{1}{n_1^2} - \frac{1}{n_2^2})$.For hydrogen,$Z = 1$,so $\bar{
u} = R 	imes (\frac{1}{3^2} - \frac{1}{4^2})$.$\bar{
u} = R 	imes (\frac{1}{9} - \frac{1}{16}) = R 	imes (\frac{16 - 9}{144}) = \frac{7R}{144} \ cm^{-1}$.

Which will be the first emission line in the infrared region of the hydrogen atomic spectrum?

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