] where, ni=3,4,5,.........∞ When transition of electron takes place from ni=3 to nf=2, wavelength of emitted photon is maximum, given by
1
λmax
=RH[
1
22
−
1
32
] or λmax=6563Å When transition of electron takes place from ni=∞ to nf=2 wavelength of emitted photon is minimum, given by
1
λmin
=RH[
1
22
−
1
∞2
] or λmin=3646Å The range of the wavelength thus calculated is equivalent to the wavelength range at visible region of spectrum. ∴ Balmer series lie in the visible region of electromagnetic spectrum.