Chapter 7 - Characteristics of a wave lectromagnetic...

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Characteristics of a wave Electromagnetic radiation: Transmission of energy in which electric and magnetic fields are propagated as waves. Wavelength ( λ ) Units : cm, m Frequency ( ν ) Units : s -1 (hertz: Hz) Velocity: Product of λ and ν . c = λ . ν Velocity of electromagnetic radiation (OR) Speed of light 2.9979 x 10 8 ms -1 IN VACCUM http://image.tutorvista.com/content/atomic-structure/wave-motion.gif
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Atomic/ Line spectrum Elements absorb radiation of specific wavelength. Discontinuous spectrum is seen. The wavelength is characteristic of the element. Can be recorded. Can be used to identify elements in some cases. http://cwx.prenhall.com/bookbind/pubbooks/hillchem3/medialib/media_portfolio/text_images/CH07/FG07_15.JPG
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Hydrogen line spectrum http://faculty.colostate-pueblo.edu/linda.wilkes/111/3c.htm Atomic spectra are discontinuous line only few wavelengths Atomic spectra could not be explained by classical mechanics. nm
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http://sol.sci.uop.edu/~jfalward/particlesandwaves/particlesandwaves.html Photoelectric effect 1. Electron emission occurs after the frequency exceeds ( ν 0 or f 0 ). 2. Number of electrons depends on intensity of light. 3. Kinetic energy of emitted electrons depends on frequency of light.
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Recall Rutherford model (Chapter 2) Failure of classical theory: Electrons can collapse into nucleus. Failures of classical mechanics
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Chapter 7 - Characteristics of a wave lectromagnetic...

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