Characteristic line spectra only appear in the visible region of light.

Question: Characteristic line spectra only appear in the visible region of light.

Actually, characteristic line spectra can appear in various regions of the electromagnetic spectrum, not just the visible region. These spectra are produced when electrons in an atom transition between energy levels, emitting or absorbing photons at specific wavelengths. 

While many of these lines fall within the visible spectrum, others can be found in the ultraviolet (UV) and infrared (IR) regions as well. For example, the Lyman series of hydrogen is in the UV region, while the Paschen series is in the IR region.

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