Transcription: Your second tool up at the top is the spectra panel. At the moment this is showing an emission spectrum, bright lines on a dark background. But clicking on the absorption button changes it to an absorption spectrum. The visible spectrum is shown coloured and the infrared region, the low energy region below the red, and the ultraviolet region, the high energy region beyond the violet, are both shown in grey. Scrolling through the spectrum is done in the same way as for the energy levels, except this time the display scrolls in the horizontal direction. And clicking on the arrows on the scale co ...
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