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Electromagnetic Radiation

Learn about the properties of electromagnetic radiation waves, the energy of photons, electron transitions in the Bohr model, and the hydrogen emission lines. Provide feedback and suggestions for improvement.

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Electromagnetic Radiation

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  1. Electromagnetic Radiation February 26, 2007 Chem 102B

  2. Hydrogen Emission Spectrum • High-energy sparks inside a tube containing hydrogen gas (H2) cause the H-H bond to break, leaving atomic hydrogen. • The atomic hydrogen is excited, and when it relaxes it releases energy in the form of light.

  3. Electromagnetic Radiation Spectrum

  4. Properties of waveswavelength = λfrequency = νspeed = cc = speed of light2.9979 x 108 m/s

  5. Energies of a photon • Electromagnetic radiation travels in waves that are packaged into photons (quantum). • Given frequency (ν) or wavelength (λ) you can calculate the energy of a single photon. • E = hν = hc/λ • If the photon has energy does it have mass? • If an electron is in motion, does it have a λ?

  6. Energy of the hydrogen emission lines • Each emission line is associated with a specific energy. • E = hc/λ

  7. Hydrogen electron transitions

  8. Bohr Model • Electrons orbit the nucleus • Only certain orbits are allowed. (n=1,2,3,4 . . .∞) • Energy of the orbit is • En=-Z2RH/n2 • Electrons move from one orbit to another by absorbing or emitting light.

  9. Anonymous Evaluation Time • What have you liked so far about the course? • What suggestions do you have for improvement of the course? • Are you able to read the material presented on the chalk board and/or do you want more powerpoint talks? • What can Dr. Richmond do to help facilitate your learning? • What do you need to do to improve your course performance? • Other comments (TAs, quizzes, tests, homework, Lon-Capa, etc.)

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