101708 - Chapter 7 Atomic Structure and Periodicity 7.1 7.2...

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Chapter 7 Atomic Structure and Periodicity 7.1 Electromagnetic Radiation 7.2 The Nature of Atoms 7.3 The Atomic Spectrum of Hydrogen 7.4 The Bohr Model 7.5 The Quantum Mechanical Model 7.6 Quantum Numbers 7.7 Orbital Shapes and Energies
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Electromagnetic Radiation
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Electromagnetic Radiation
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Who is Jed the Fish? KROQ frequency = ν = 106.7 Mhz What is the wavelength?
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Who is Jed the Fish? KROQ frequency = ν = 106.7 Mhz What is the wavelength? λ = c / ν λ = 3.00 X 10 8 m s -1 / 106.7 X 10 6 s -1 λ = 2.81 m
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How long is a car antenna? quarter wave antenna Antenna length = λ /4 = 0.703 m or 27.7 in
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How big is a microwave oven? Typical microwave frequency 2.45 Gigahertz
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How big is a microwave oven? λ = 3.00 X 10 8 m s -1 / 2.45 X 10 9 s -1 λ = 0.122 m ( ~ 5 in)
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Energy matching “Dust” particles in the sky are about 400 nm in diameter. Which wavelengths of light might scatter from these particles? Consult figure 7.2 What color is this light? What color is the sky?
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Something's rotten in Denmark! Observations of Dulong and Petit The temperature of 1 molar mass (g) of an elemental solid rises by 1 degree for every 25 J of energy absorbed
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Something's rotten in Denmark! Observations of Dulong and Petit C s = 25 J/molar mass (g) ° C Ni C s = 25 J/58.69 g ° C C s = 0.43 estimated 0.444 J/ g ° C actual Al C s = 0.93 estimated 0.900 J/ g ° C actual
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Something's rotten in Denmark! Observations of Dulong and Petit C s = 25 J/molar mass (g) ° C But, this relationship does not hold at very low temperature! Cs 0 as T 0
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Something's rotten in Denmark! When an object is heated, the wavelength of maximum intensity shifts to shorter wavelengths . dull red bright red white hot Part II
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Something's rotten in Denmark! When classical physics ( F = ma, λ = c / ν , etc. ) was used to model this behavior, it predicted that any warm object would emit tremendous amounts of ultraviolet light! even x-rays and gamma rays! The ultraviolet catastrophe paradox ! Part II
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Something's rotten in Denmark! Hey Dr. Rutherford! If you're so smart, how come your electron ( negative charge ) doesn't go crashing into your proton ( positive charge )!
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This note was uploaded on 12/06/2009 for the course CHEM 105A taught by Professor Bau during the Fall '04 term at USC.

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101708 - Chapter 7 Atomic Structure and Periodicity 7.1 7.2...

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