In a simple emission spectrograph, excitation of the specimen under investigation is accomplished with a(n):

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In a simple emission spectrograph, excitation of the specimen under investigation is typically accomplished using an electrical arc, which creates a plasma that emits characteristic wavelengths of light that can be analyzed to determine the elemental composition of the specimen. The other choices (activated prism, inductive magnetic field, ultraviolet light source) are not commonly used for excitation in this type of spectroscopy. A hot plasma torch could be used, but it is not necessary for a simple emission spectrograph.

In a Simple Emission Spectrograph, Excitation of the Specimen Under