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astro lecture 1 - Radiation Laws and Spectra Last time The...

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Radiation Laws and Spectra Last time The nature of light Interaction of light and matter EM spectrum Properties of matter What is the electromagnetic spectrum? What is the structure of matter? Atom Nucleus Electron Cloud
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Energy Level Transitions The only allowed changes in energy are those corresponding to a transition between energy levels Allowed Not Allowed Continuous Spectrum The spectrum of a common (incandescent) light bulb spans all visible wavelengths, without interruption Emission Line Spectrum A thin or low-density cloud of gas emits light only at specific wavelengths that depend on its composition and temperature, producing a spectrum with bright emission lines Absorption Line Spectrum A cloud of gas between us and a light bulb can absorb light of specific wavelengths, leaving dark absorption lines in the spectrum
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Chemical Fingerprints Each type of atom has a unique set of energy levels Each transition corresponds to a unique photon energy,
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