?Bohr’s Model of the Hydrogen AtomHydrogen accounts for about 75% by mass of the matter

Chapter 6, Problem 28

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Bohr’s Model of the Hydrogen Atom

Hydrogen accounts for about 75% by mass of the matter at the surfaces of most stars. However, the absorption lines of hydrogen are strongest (of highest intensity) in the spectra of stars with a surface temperature of about 9000 K. They are weaker in the sun spectrum and are essentially nonexistent in very hot (temperatures above 25,000 K) or rather cool (temperatures below 3500 K) stars. Speculate as to why surface temperature affects the hydrogen absorption lines that we observe.

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