ELECTRO MAGNETIC SPECTRUM. The electromagnetic spectrum extends from wavelengths of many meters to wavelengths of submicroscopic size. Visible light has wavelengths of less than one millionth of a meter. Chemical elements in a star’s atmosphere emit and absorb light at different wavelengths.
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or a colored liquid is placed in front of a full spectrum light source; the
element will absorb some of the light and let some of it pass through.
Which colors does hydrogen absorb?
The next slide shows emission spectra on top and absorption spectra underneath. Compare the emission spectrum of helium (top), with its absorption spectrum (bottom)
How do we find what stars are made of?
(a) Mona Koa is 4-km above sea level. The air is so thin that astronomers wear oxygen masks. (b) the 10-m mirror of Keck1.