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<p>mass-to-charge ratio in <a href="page.php?w=mass_spectrometry">mass spectrometry</a>.</p>

<p><big> Etymology </big></p>
<p><big> Electromagnetic spectrum </big></p>
<p>Electromagnetic spectrum refers to the full range of all frequencies of <a href="page.php?w=electromagnetic_radiation">electromagnetic radiation</a> and also to the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object. Devices used to measure an electromagnetic spectrum are called <a href="page.php?w=spectrograph">spectrograph</a> or <a href="page.php?w=spectrometer">spectrometer</a>.</p><p>
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