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Essential Question  Why/how does the sound from a passing car change?

Essential Question  Why/how does the sound from a passing car change?. http://www.kettering.edu/~drussell/Demos/doppler/doppler.html. Stationary Source and Stationary Observers. http://www.kettering.edu/~drussell/Demos/doppler/doppler.html. Stationary Source but Moving Observer.

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Essential Question  Why/how does the sound from a passing car change?

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  1. Essential Question Why/how does the sound from a passing car change?

  2. http://www.kettering.edu/~drussell/Demos/doppler/doppler.htmlhttp://www.kettering.edu/~drussell/Demos/doppler/doppler.html

  3. Stationary Source and Stationary Observers http://www.kettering.edu/~drussell/Demos/doppler/doppler.html

  4. Stationary Source but Moving Observer http://www.kettering.edu/~drussell/Demos/doppler/doppler.html

  5. Moving Source but Stationary Observer http://www.kettering.edu/~drussell/Demos/doppler/doppler.html

  6. Moving Source but Stationary Observer Doppler Effect Car Passing RaceCar TrainPassing

  7. DOPPLER (Δvelocity effect) • A stationary sound source is emitting a 550 Hz buzz. You ride your bike toward the sound at 5 m/s… what do you hear?

  8. DOPPLER (Δwavelength effect) • You are standing on the side of the road as a police car approaches… it is traveling at 20 m/s and actually producing a 600 Hz siren… What do you hear?

  9. Doppler Radar http://kfty.com/weather/interactive/

  10. Another example of using the Doppler Effect

  11. Doppler Effect: Sound… Moving source causes a change in frequency for stationary observers. What else might the Doppler Effect affect?

  12. EXTREME "DOPPLER-like" Situations

  13. http://www.kettering.edu/~drussell/Demos/doppler/doppler.htmlhttp://www.kettering.edu/~drussell/Demos/doppler/doppler.html

  14. Source Moving as fast as the waves it is making.

  15. Object traveling FASTER thanthe waves it is making.

  16. Source Moving FASTER than the waves it is making. http://www.kettering.edu/~drussell/Demos/doppler/doppler.html

  17. Source Moving FASTER than the waves it is making. CrestCrest Crest + Crest Big fatty Crest

  18. The Learning Channel – “Extreme Machines”

  19. October 14 1947 Chuck Yeager – October 14, 1947

  20. Source Moving FASTER than the waves it is making. CrestCrest Crest + Crest Big fatty Crest

  21. http://www.kettering.edu/~drussell/Demos/doppler/doppler.htmlhttp://www.kettering.edu/~drussell/Demos/doppler/doppler.html

  22. 2193.16 miles per hour

  23. http://www.ctrl-c.liu.se/ftp/images/AVIATION/MILITARY/USA/f14/f14-3.jpghttp://www.ctrl-c.liu.se/ftp/images/AVIATION/MILITARY/USA/f14/f14-3.jpg F-14Tomcat http://www.mediacen.navy.mil/pubs/allhands/jan01/f14tomcat.jpg

  24. SOUND Intensity dB – Decibels… better thought of as deci - Bells

  25. Jet Engine at 30 m Threshold of Pain,Siren, Loud Rock Concert Lawn Mower Vacuum Cleaner Normal Conversation Mosquito Buzzing Whisper Rustling Leaves,Normal Breathing Threshold of hearing 140 dB 120 dB 100 dB 70 dB 50 dB 40 dB 20 dB 10 dB 0 Loudness of Sound 0 dB to 10 dB = 101 = 10 times louder = 101 10 dB to 20 dB = 10 times louder = 10*10 or 102 20 dB to 40 dB = 100 times louder = 10*10*10 or 103 40 dB to 70 dB = 1000 times louder = 105 70 dB to 120 dB = 100,000 x louder 15.2 dB to 48.4 dB = 48.4 – 15.2 = 33.2 = 103.32 = 2,089 x louder

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