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

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Chapter 7 1 Atomic Structure Atomic Structure Chapter 7 Chapter 7
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Chapter 7 2 Electromagnetic Radiation Electromagnetic Radiation - Visible light is a small portion of the electromagnetic spectrum
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Chapter 7 3 Frequency ( v, nu 29 – The number of times per second that one complete wavelength passes a given point. Wavelength ( λ, lambda) The distance between identical points on successive waves. λ v = c c = speed of light, 2.997 x 10 8 m/s Electromagnetic Radiation Electromagnetic Radiation
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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
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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 = planck’s 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 Planck’s Equation Planck’s Equation
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Chapter 7 6 Planck, Einstein, Energy and Photons Planck, Einstein, Energy and Photons The Photoelectric Effect The Photoelectric Effect
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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
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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 ν . Planck, Einstein, Energy and Photons Planck, Einstein, Energy and Photons
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Chapter 7 9 Bohr’s Model of the Hydrogen Atom Bohr’s Model of the Hydrogen Atom Line Spectra Line Spectra
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Chapter 7 10 Bohr’s Model of the Hydrogen Atom Bohr’s Model of the Hydrogen Atom Line Spectra Line Spectra
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Chapter 7 11 Bohr’s Model of the Hydrogen Atom Bohr’s Model of the Hydrogen Atom Line Spectra Line Spectra
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