lecture 17 - reflection, transmission, dispersion

lecture 17 - reflection, transmission, dispersion -...

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Unformatted text preview: Announcements 2/14/11 Prayer Exam 1: last day = tomorrow! We’re likely not going to finish dispersion today, so extra time on Lab 3: now due Tues Feb 22. Monday Feb 21 is President’s Day holiday. Tues Feb 22 is a virtual Monday Complex numbers & traveling waves Traveling wave: A cos(kx – ϖ t + φ ) Write as: Often: …or – where “A-tilde” = a complex number, the phase of which represents the phase of the wave – often the tilde is even left off ( 29 ( ) i kx t f t Ae ϖ φ- + = ( 29 ( ) i kx t i f t Ae e ϖ φ- = ( 29 ( ) i kx t f t Ae ϖ- = % Reading Quiz Which of the following was not a major topic of the reading assignment? a. Dispersion b. Fourier transforms c. Reflection d. Transmission Thought Question Which of these are the same? (1) A cos(kx – ϖ t) (2) A cos(kx + ϖ t) (3) A cos(–kx – ϖ t) a. (1) and (2) b. (1) and (3) c. (2) and (3) d. (1), (2), and (3) Which should we use for a left-moving wave: (2) or (3)?...
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lecture 17 - reflection, transmission, dispersion -...

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