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SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
H-He-Hg emission spectra. Graphical representation of the emission spectra lines for the elements hydrogen (H), helium (He) and mercury (Hg). The vertical bars represent the colour and wavelength (in nanometres) of the lines seen in spectra from light emitted by excitation of these elements in gaseous form. Studying the peaks in emission spectra from unknown materials enables the identification of elements present in those materials, a technique known as emission spectroscopy.
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