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astr101_10_LightAndAtoms.pdf - Astronomy 101 Light and...

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Astronomy 101Light and Atoms
Review: The Electromagnetic (EM) SpectrumEM waves of any frequency can exist.2Gamma rays have theshortest wavelength,highest energy,highest frequency.Radio waves have thelongest wavelength,lowest energy, lowestfrequency.The visible is allwe can see withour eyes.
SpectroscopySpectroscopy: studying of the EM spectra producedwhen light interacts with matter, especially when lightis emitted from an object.The type of spectra an object gives off depends on thephysical situation.We will studyTHREEtypes of spectraContinuous spectrumEmission SpectrumAbsorption Spectrum
We will study three types of spectraContinuous SpectrumHot/Dense Energy SourceprismEmission Line SpectrumprismHot low density cloud of GasAbsorption LineSpectrumCooler low density cloud of GasHot/Dense Energy Sourceprism
Spectroscopy: Continuous Spectrum5A hot, solid object will emit a continuous spectrum.A blackbody curve is an example of a continuous spectrum.
We will study three types of spectraContinuous SpectrumHot/Dense Energy SourceprismA hot, solid (dense) object will emit a continuous spectrum.
Review: Blackbody RadiationEverything that has anonzero temperatureemits radiation (light)Blackbody spectrum:Graph of an object’slight output vs.frequency (orwavelength)A blackbody curve is an example of a continuous spectrum.
Kirchhoff’s Law #2– The excited atoms within ahot, cloud of gas give off only particular colors(wavelengths) of light and produce anemission line spectrum- a series of brightspectral lines against a dark background.The type of spectrum given off dependson the objects involved (Kirchhoff’s Laws)To understand this, we must first understand a little moreabout how atoms interact with light.
We will study three types of spectraEmission Line SpectrumprismHot low density cloud of GasTo understand how this works, we must first understand alittle more about how atoms interact with light.

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Term
Winter
Professor
bennert
Tags
Photon, Emission spectrum

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