The observed wavelengths in the line spectrum of hydrogen atom were first expressed in terms of a series by Johann Jakob Balmer, a Swiss teacher. Balmer's empirical formula is
`(1)/(lambda) = R_(H)[(1)/(2^(2)) - (1)/(n^(2))] = n = 3, 4,5…`
`R_(H) = 109678 cm^(-1)` is the Rydberg constant.
Niels Bohr derived this expression theoretically in 1913. The formula is a generalised to any on electron atom/ion.
The wavelength of first line of Balmer spectrum of hydrogen will be :

Options

A. 4340 Å
B. 4101 Å
C. 6569 Å
D. 4861 Å

Answer

C