Lecturez13SHWeb

Lecturez13SHWeb - Fri. Oct. 07, 2011 Todays Lecture Quantum...

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1 Fri. Oct. 07, 2011 Today’s Lecture Quantum Mechanics and Atomic Theory • 12.1 Electromagnetic Radiation • 12.2 The Nature of Matter • 12.3 The Atomic Spectrum of Hydrogen Lecture 13
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2 – examine atomic theory and periodicity of elements – modern theory of atoms accounts for periodicity – quantum mechanics was developed to explain the behavior of light and atoms
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3 • Electromagnetic radiation: – visible light, x-rays, infrared, ultraviolet, etc. – one way energy can travel through space – has wavelike behavior and travels at the speed of light in vacuum Fig. 12.1
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4 – waves have 3 characteristics: wavelength ( λ : lambda): meters – distance between 2 consecutive peaks – _______________________________ frequency ( ν : nu): s -1 (Hz) – # of waves (cycles) / second 07_93 1 second λ 1 ν 1 = 4 cycles/second = 4 hertz ν 2 = 8 cycles/second = 8 hertz λ 2 λ 3 ν 3 = 16 cycles/second = 16 hertz Fig. 12.2
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5 speed c : m/s c = speed of light = 2.9979 x 10 8 m/s – Relationship between wavelength and frequency: 10 -12 10 -10 10 -8 4 x 10 -7 Gamma rays X rays Ultraviolet Infrared Microwaves Radio waves FM Shortwave AM 4 x 10 -7 Wavelength in meters 5 x 10 -7 6 x 10 -7 7 x 10 -7 7 x 10 -7 10 -4 10 -2 1 10 2 10 4 Visible Fig. 12.3
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6 • Nature of Matter: – late 1800s: • matter was thought to consist of particles • electromagnetic radiation was described as a wave
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This note was uploaded on 12/10/2011 for the course CHEM 121 taught by Professor Leech during the Fall '11 term at Simon Fraser.

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Lecturez13SHWeb - Fri. Oct. 07, 2011 Todays Lecture Quantum...

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