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Emission Spectrum Of Helium Photograph by Dept. Of Physics, Imperial College/science Photo Library - Pixels
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quantum mechanics - What does the $y$-axis represent in the atomic spectra and what is its significance? - Physics Stack Exchange
![H-He-Hg emission spectra. Graphical representation of the emission spectra lines for the elements hydrogen (H), helium (He) and mercury (Hg). The vert Stock Photo - Alamy H-He-Hg emission spectra. Graphical representation of the emission spectra lines for the elements hydrogen (H), helium (He) and mercury (Hg). The vert Stock Photo - Alamy](https://c8.alamy.com/comp/2ACR8TC/h-he-hg-emission-spectra-graphical-representation-of-the-emission-spectra-lines-for-the-elements-hydrogen-h-helium-he-and-mercury-hg-the-vert-2ACR8TC.jpg)
H-He-Hg emission spectra. Graphical representation of the emission spectra lines for the elements hydrogen (H), helium (He) and mercury (Hg). The vert Stock Photo - Alamy
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