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Ch 5.1 Quantum Mechanics - Chapter 5 Quantum Mechanics and...

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Chapter 5 1 Chapter 5: Quantum Mechanics and Atomic Theory Georgia Tech Chem 1310J Fall 2009 “Sweet Photons. I don’t know if you’re waves or particles, but you go down smooth.” -Bender
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Chapter 5 2 Waves and Light Electromagnetic Radiation Energy travels through space as electromagnetic radiation Examples: sunlight, microwave ovens, cell phones, X-rays, radiant heat from a fireplace, AM/FM radio, colors from fireworks All travel as waves All travel at the speed of light
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Chapter 5 3 Electromagnetic Waves Light consists of waves of oscillating electric (E) and magnetic fields (H) that are perpendicular to one another and to the direction of propagation of the light. The waves travel at the speed of light.
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Chapter 5 4 Properties of Waves c = λ ν c = 3 x 10 8 m/s λ = wavelength ν = frequency etc
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Chapter 5 5 The Electromagnetic Spectrum
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Chapter 5 6
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Chapter 5 7 Physics at the End of the 19th Century Physicists at the end of the 1800’s thought they had solved all of the important problems. Maxwell’s electromagnetic theory had unified knowledge of electricity, magnetism and waves. Classical mechanics was a well-established field. Matter consisted of particles , they had mass, and their positions in space were well defined. Energy (electromagnetic radiation) was described as waves which were massless and delocalized (a position in space could not be specified). All that remained for physicists to do was mop up a few lingering questions.
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Chapter 5 8 One of the remaining trivial problems: Blackbody Radiation When matter is heated it emits electromagnetic radiation.
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