The first emission line in the atomic sp...

The first emission line in the atomic spectrum of hydrogen in the Balmer series appears at

`9R_H/400 cm^-1`

`7R_H/144 cm^-1`

`3R_H/4 cm^-1`

`5R_H/36 cm^-1`

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The observed wavelength in the line spectrum of hydrogen atom were first expressed in term of a series of johann jakob Balmer a series teacher Balmer's empirical formula is 1/lambda=R_H(I/2^2-I/N^2) ________ n ge 3 , R_H=109678cm^-1 is Rydberg constant. Niele Bohr derived this expression theoretically in 1913 the formula is generalized to any uni-electronic species. Calculate the longest wavelength in the Balmer series of singly ionized He^+

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