CH2 skeleton

CH2 skeleton - Chapter 2: What is Quantum Mechanics?...

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Chapter 2: Classical Physics is unable to describe: objects going very fast objects that are very small Relativity Quantum Mechanics What is Quantum Mechanics? • Mathematical Theory • “describes the behavior of objects that are roughly 10,000,000,000 times smaller than a typical human being.” Key Concepts: Quantization Wave-Particle Duality Probability Uncertainty http://rugth30.phys.rug.nl/quantummechanics/ Early model of the atom Much of what we know about matter is based on the way electrons interact with L I G H T . Light is a form of energy Electron + light = higher energy electron Electron – light = lower energy electron Section 2.1
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Electromagnetic spectrum Light exists as a wave Long wavelength Short Wavelength Section 2.1 Waves have repeat lengths, frequencies and intensities. Frequency All light waves travel at the same speed, the speed of light (c) 2.998x10 8 ms -1 Section 2.1 Long Wavelength Low Frequency LOW ENERGY Short Wavelength High Frequency HIGH ENERGY c is the speed of light (2.9x10 8 m/s) λ is wavelength (m) ν is frequency (s -1 or hertz) Section 2.1 Wavelength and Frequency constant! So, if you know wavelength, you know frequency and vice versa!
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Electromagnetic spectrum Is light a wave or a particle? Classical Experiments: Light is a wave c = λ ν Planck and Einstein: Light energy is quantized and is composed of massless 'particles' called photons Wave- particle Duality of light h = Planck's constant 6.626x10 -34 J·s , c=speed of light Line spectrum of hydrogen gas Violet λ = 410 nm Blue λ = 434 nm Blue-green λ = 486 nm Red λ = 656 nm Neon Signs (~ 1870) Atomic Spectra: Light Absorption and Emission Law of Conservation of Energy Energy cannot be created nor destroyed. Conclusion: The energy of the emitted photon (h ν ) must come from an energy change within the atom, Δ E atom E photon Δ E atom = Conclusion: Since the energy of the emitted photons is quantized, the energy of the atom is quantized. ..
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The Bohr Model of the Hydrogen Atom •Bohr introduced quantum theory into the atomic model
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CH2 skeleton - Chapter 2: What is Quantum Mechanics?...

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