L02AtomicI145s09c

L02AtomicI145s09c - Lecture 2, spring 2009 ENGR 145:...

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Unformatted text preview: Lecture 2, spring 2009 ENGR 145: Chemistry of Materials Case Western Reserve University Lecture 2 Atomic Theory I Waves, Light, & Electrons Reading assignment: OGC 4.1-4.3 Learning objectives: Understand how data on blackbody radiation contributed to the development of quantum mechanics. Understand how the photoelectric effect illustrates the particle nature of light , and how it allows measurement of the work function of a surface. Be able to compute the Bohr radius and allowed energy levels for electrons in one-electron atoms. ENGR 145: Chemistry of Materials Case Western Reserve University Classical Mechanics vs. Quantum Mechanics Classical mechanics : energy of a system can be continuously* varied Quantum mechanics : energy states are quantized * This turns out to be true if the energy changes are large compared to quantum phenomena Lecture 2, spring 2009 Wave motion: Amplitude, A Wavelength, [m] Frequency, [s-1 ] = 1/ Velocity or speed [m/s] ENGR 145: Chemistry of Materials Case Western Reserve University Wave Motion (OGC 4.1) A OGC Figure 4.1: water wave = Lecture 2, spring 2009 ENGR 145: Chemistry of Materials Case Western Reserve University Light as Waves (OGC 4.1) OGC Figure 4.2: light wave c = l n Light: electromagnetic radiation Electric field, E Magnetic field, H Speed of light in vacuum: c = 2.9979 . 10 8 m s 1 a fundamental constant For light propagating in vacuum, When light propagates from one medium to another, its wavelength and speed change, but its frequency remains constant: = c 1 l 1 = c 2 l 2 Lecture 2, spring 2009 ENGR 145: Chemistry of Materials Case Western Reserve University Electromagnetic Spectrum Visible light is only a small part of the EM spectrum (OGC Figure 4.3) Approximate color scale: 400-450 nm: violet 450-500 nm: blue 500-550 nm: green 550-600 nm: yellow 600-650 nm: orange 650-700 nm: red Lecture 2, spring 2009 ENGR 145: Chemistry of Materials...
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L02AtomicI145s09c - Lecture 2, spring 2009 ENGR 145:...

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