L18_16Feb_posted - Physics 6B Housekeeping In case you...

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1 Doppler effect Physics 6B The Doppler Shift & An Intro to Light 2 Housekeeping In case you hadn’t found it already, Mastering in Physics has a “review part” option which will review hints and the overall solution. Solutions to Midterm 1 posted. Midterm 2 on Monday 2/28 ! Review session Sunday 2/27, 1:00-3:00pm in Physical Science 110 I will NOT be in my office after class -- e-mail me if you need to meet. 3 Sound waves in pipes These pictures of harmonics * in pipes overlay a graph of air particle displacement on the pipe. Particles actually move back-and-forth along pipe. * a.k.a. “normal modes” or “resonant frequencies 4 Doppler effect The perceived wavelength and frequency of waves is affected by the relative motion of the source and the observer Waves appear to have shorter wavelengths, higher frequency if… ! you are moving towards the source… ! or the source is moving towards you Waves appear to have longer wavelengths, lower frequency if… ! you are away from the source… ! or the source is moving away from you
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5 6 Moving wave source 7 Moving source When source is moving ! apparent wavelength changes !
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