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    3. Wavelength is Color Blue Light: l = 450 nm (nanometers) Yellow light: l = 550 nm Green light: l = 600 nm Red light: l = 700 nm

    4. Spectroscopy

    5. Spectroscopy Continuum -- Rainbow Absorption -- Dark Lines Emission -- Bright Lines

    7. But What Causes Spectral Lines? An absorption line (dark line) represents light that has been removed from the spectrum at one particular wavelength An emission line (bright lines ) represents light that was added to the light of the star

    8. Atoms Every atom consist of a nucleus plus electrons, which can be in different energy states The Bohr Model of the atom imagines the electrons in orbits When an electron jumps from one orbit to another it gives of energy, its energy changes. If it is moving to a lower orbit it emits a photon of light If it is moving to a higher orbit it absorbs a photon

    12. If light from a source passes through a gas cloud, some of it will be absorbed, producing an absorption spectrum If light comes from a hot gas cloud, it will produce an emission spectrum If light comes to us directly, it will produce a continuum spectrum What Causes Spectral Lines?

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