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The Doppler Effect

The Doppler Effect. 16.9. Doppler Effect. Have you ever listened to campus safety drive by quickly with their lights and sirens going? What did it sound like? High pitch as they were coming, low pitch as they were leaving. Called Doppler effect after Christian Doppler who first labeled it.

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The Doppler Effect

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  1. The Doppler Effect 16.9

  2. Doppler Effect • Have you ever listened to campus safety drive by quickly with their lights and sirens going? • What did it sound like? • High pitch as they were coming, low pitch as they were leaving. • Called Doppler effect after Christian Doppler who first labeled it.

  3. Stationary Source

  4. Moving Source

  5. Deriving the Formula – Moving Source • Moving toward object • ’ =  - vsT • Where •  = wavelength of wave • ’ = perceived wavelength • vs = velocity of source • T = Period of wave

  6. Deriving the Formula – Moving Source fo = frequency observed v = speed of wave ’ = perceived wavelength fo = frequency observed fs = frequency of source v = speed of wave vs = speed of source

  7. Moving Observer • Encounters more condensations than if standing still

  8. General Case • Combine the two formulas • Both observer and source can be moving • WARNING! • v, vs, and vo are signless • Use the top signs when that object is moving towards the other object

  9. A Use of Doppler • NEXRAD • NEXt generation weather RADar • Sends out radio waves • Wave bounce of water drops in storms • Radar receives echoes • Computer checks to compare the frequencies • Can compute to see how fast the clouds are spinning

  10. Practice Problems • Move yourselves to do these exercises • 477 CQ16, 18-20, P 70 – 74 • Total of 9 Problems

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