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Doppler Shift

Doppler Shift. Demo/examples: race cars, bells at RR crossing Frequency: (Key to understanding this) Higher approaching Lower receding Moving source/moving observer. Doppler Shift - moving source. Sitting Still. Moving to the right. Doppler Shift - moving source.

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Doppler Shift

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  1. Doppler Shift • Demo/examples: race cars, bells at RR crossing • Frequency: (Key to understanding this) • Higher approaching • Lower receding • Moving source/moving observer

  2. Doppler Shift - moving source Sitting Still

  3. Moving to the right Doppler Shift - moving source Source creates smaller wavelengths in front, longer in back

  4. Observer Doppler Shift - moving observer Motion of the source makes you experience different frequencies

  5. Doppler Shift - moving source ’ = shifted wavelength f’ = shifted frequency f = source frequency  = un-shifted wavelength us = speed of source v = speed of sound

  6. Doppler Shift - moving observer f’ = shifted frequency f = source frequency uo = speed of observer v = speed of sound

  7. Doppler Shift 1 | 2 | 3 | 4 TOC

  8. A car with a 256 Hz horn approaches you at 40.0 m/s. What frequency do you hear? (3) (use v sound = 343 m/s) 290. Hz

  9. What speed in what direction is the same car (f = 256 Hz) moving if you hear 213 Hz (use v sound = 343 m/s) 69.2 m/s away from you

  10. You run at 8.50 m/s toward a violinist playing 660. Hz. What frequency do you hear? (Use 343 m/s as the speed of sound) 676 Hz

  11. A running person who is late for a concert hears the concertmaster who is playing an A 440. Hz. How fast and in what direction are they running if they hear a frequency of 463 Hz. (use v sound = 343 m/s) 17.9 m/s

  12. You are driving on a road, and a car coming the other way has a horn with a frequency of 256 Hz. The oncoming car is going 20.0 m/s toward you, and you are going 60.0 m/s toward them. What frequency do you hear? 319.4 Hz

  13. You are overtaking a car on a road. You have a car horn with a frequency of 100.0 Hz, and you are going 48.00 m/s, behind a car going 23.00 m/s. When you honk your horn, what frequency does the the person in the other car hear? Use the speed of sound to be 343.0 m/s Moving source, then moving observer higher frequency, lower frequency 108.5 Hz

  14. You are driving down a road at 12.0 m/s toward a wall. You honk your horn that has a frequency of 148 Hz. What frequency do you hear the reflection off the wall? Use 343 m/s as the speed of sound. Moving source, then moving observer higher frequency, lower frequency 159 Hz

  15. You are driving down a road at 27.00 m/s toward a truck going 17.00 m/s in the same direction. You honk your horn that has a frequency of 1000. Hz. What frequency do you hear the reflecting off the truck? Use 343 m/s as the speed of sound. Moving source, then moving observer higher frequency, lower frequency 1060.3 Hz

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