CHAP07_new - Chapter 7 1 Atomic Structure Atomic Structure...

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Unformatted text preview: Chapter 7 1 Atomic Structure Atomic Structure Chapter 7 Chapter 7 Chapter 7 2 Electromagnetic Radiation Electromagnetic Radiation- Visible light is a small portion of the electromagnetic spectrum Chapter 7 3 Frequency ( v, nu 29 The number of times per second that one complete wavelength passes a given point. Wavelength ( , lambda) The distance between identical points on successive waves. v = c c = speed of light, 2.997 x 10 8 m/s Electromagnetic Radiation Electromagnetic Radiation Chapter 7 4- When talking about atomic structure, a special type of wave is important: Standing Wave : A special type of wave with two or more stationary point with no amplitude. Electromagnetic Radiation Electromagnetic Radiation Chapter 7 5- We can also say that light energy is quantized- This is used to explain the light given-off by hot objects. - Max Planck theorized that energy released or absorbed by an atom is in the form of chunks of light (quanta). E = h v h = plancks constant, 6.63 x 10-34 J/s- Energy must be in packets of (h v ), 2(h v ), 3(h v ), etc. Planck, Einstein, Energy and Photons Planck, Einstein, Energy and Photons Plancks Equation Plancks Equation Chapter 7 6 Planck, Einstein, Energy and Photons Planck, Einstein, Energy and Photons The Photoelectric Effect The Photoelectric Effect Chapter 7 7 The Photoelectric Effect The Photoelectric Effect- The photoelectric effect provides evidence for the particle nature of light.- It also provides evidence for quantization.- If light shines on the surface of a metal, there is a point at which electrons are ejected from the metal.- The electrons will only be ejected once the threshold frequency is reached .- Below the threshold frequency, no electrons are ejected.- Above the threshold frequency, the number of electrons ejected depend on the intensity of the light. Planck, Einstein, Energy and Photons Planck, Einstein, Energy and Photons Chapter 7 8 The Photoelectric Effect The Photoelectric Effect- Einstein assumed that light traveled in energy packets called photons.- The energy of one photon, E = h . Planck, Einstein, Energy and Photons Planck, Einstein, Energy and Photons Chapter 7 9 Bohrs Model of the Hydrogen Atom Bohrs Model of the Hydrogen Atom Line Spectra Line Spectra Chapter 7 10 Bohrs Model of the Hydrogen Atom Bohrs Model of the Hydrogen Atom Line Spectra Line Spectra Chapter 7 11 Bohrs Model of the Hydrogen Atom Bohrs Model of the Hydrogen Atom Line Spectra...
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CHAP07_new - Chapter 7 1 Atomic Structure Atomic Structure...

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