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Announcements 1/20/12

This announcement provides a review question about the phase shift of electric and magnetic fields in electromagnetic waves. It also includes a reading quiz on the important frequency for optical properties of conductors and the description of the optical properties index of refraction. Additionally, the quiz covers the vector that gives the direction of energy transfer in an EM wave and the derivation of Poynting's theorem. The announcement aims to enhance understanding of electromagnetic waves and the optical properties of conductors.

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Announcements 1/20/12

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  1. Announcements 1/20/12 • Prayer

  2. Review Question (not graded) • In an electro-magnetic wave, the electric and magnetic fields: • are always in phase • always have a relative phase shift • can have a relative phase shift when absorption takes place

  3. Reading Quiz • The most important frequency for the optical properties of a conductor is the: • decay frequency, wD • plasma frequency, wP • reflection frequency, wR • resonance frequency, w0

  4. Reading Quiz • In a conductor, the optical properties are described by a ___________ index of refraction: • totally real • totally imaginary • partially real and partially imaginary

  5. Metals: complex n From P&W Fig 2.6 (and HW P2.8…)

  6. Reflectance vs. Wavelength From Hecht Plasma frequency

  7. Reading Quiz • The vector that gives the direction of energy transfer through space in an E-M wave is called the: • Clausius vector • flow vector • Michelson vector • polarization vector • Poynting vector

  8. Energy stored in fields (appendix)

  9. Derivation of Poynting Theorem Bottom eqn minus top eqn… Multiply both sides by -1/m0 …

  10. Derivation of Poynting Theorem, cont. like a flux, call it S energy density, ufield (J includes both Jfree and Jpolar) has units of energy density/time… call it “dumedium/dt” compare to Eqn of Cont.

  11. Intensity

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