In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series or Lyman series, as shown in Fig. 1A.10). What is common to the lines within a series that makes grouping them together logical?

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(a) Infrared radiation Balmer series 954.6 656.3 -486.1 % 434.0 410.2 (b) Infrared Visible Wavelength, λ/nm 121.6 Ultraviolet radiation Lyman series - 102.6 97.3 Ultraviolet FIGURE 1A.10 (a) The infrared, visible, and ultraviolet spectrum. (b) The complete spectrum of atomic hydrogen. The spectral lines have been assigned to various groups called series, two of which are shown with their names.