L02AtomicI145s10

L02AtomicI145s10 - Lecture 2 spring 2010 ENGR 145 Chemistry...

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Unformatted text preview: Lecture 2, spring 2010 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 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 2010 • Wave motion: • Amplitude, A • Wavelength, [m] • Frequency, [s-1 ] = 1/ τ • 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 = λν λ ν Lecture 2, spring 2010 ENGR 145: Chemistry of Materials Case Western Reserve University Light as Waves (OGC §4.1) OGC Figure 4.2: light wave c = λν • Light: electromagnetic radiation • Electric feld, E • Magnetic feld, H • Speed o¡ light in vacuum: c = 2.9979 ....
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L02AtomicI145s10 - Lecture 2 spring 2010 ENGR 145 Chemistry...

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