The second member of Balmer series of hydrogen atom has wavelength 4860 A.U. Calculate Rydberg's constant. Hence calculate the energy in eV when electron is orbiting in the third Bohr orbit. [Planck's constant = 6.63 x 10-34 Js; Speed of light in vaccum = 3 x 10³ m/s; 1 eV = 1.6 × 10-¹⁹ Jl
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