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quantum mechanics - What does the $y$-axis represent in the atomic spectra and what is its significance? - Physics Stack Exchange
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Spectra of (a) a helium lamp, and of (b) a mercury lamp, obtained with... | Download Scientific Diagram
A special type of fluorescent tube contains the gas helium. When energized, it is lit by certain colors. What is this process where colored light is emitted from an atom? - Quora
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