ppt_web - Review: Light and Spectra Light is a wave It...

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1 Review: Light and Spectra • Light is a wave – It undergoes diffraction and other wave phenomena. • But light also is made of particles – Energy is carried by photons Wavelength – Computer simulation next week will feature photons arriving one-by-one. 1 energy of each photon Absorption and Emission Lines • Absorption Lines • Emission Lines Flux Î Wavelength Î IC 418 – shell of gas blown off central star. star Spectrum of Planetary nebula Spectrum of a star
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2 Absorption Lines = Atomic Excitation Bohr’s Model of the Atom Each electron orbit has its own distinct energy. For electron to move from inner orbit to one further out, it must gain exactly the energy difference between the orbits. – Can absorb photon with correct energy Energy Î + - Emission Lines = De-Excitation For electron to fall back in towards nucleus, it must lose exactly the energy difference between the orbits. – Can emit photon with correct energy Wavelength Î + -
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3 Different chemical elements have different configurations of electron orbits Î different sets of energy levels with different energy spacings Î different sets of emission lines. Hydrogen
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ppt_web - Review: Light and Spectra Light is a wave It...

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