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# Doppler's effect lo5 JY

Doppler's effect lo5

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### Doppler's effect lo5 JY

1. 1. DOPPLER'S EFFECT PHYS 101 LO5
2. 2. Real Life Experience • You must have noticed this before. As the train approaches the station, the sound of its horn at a higher pitch and as the train moved away, it is at a lower pitch.
3. 3. Real Life Experience • You must have noticed this before. As a train or a car approaches, the sound of its horn is at a higher pitch and as it moves away, the horn is at a lower pitch. (high pitch reflects high frequency) This is Doppler's effect!!
4. 4. Why does Doppler's effect occur? • Click here for a passing car horn You are here as the car approaches ↑ This is the car.
5. 5. Why does Doppler's effect occur? • Click here for a passing car horn You are here as the car approaches ↑ This is the car.
6. 6. Why does Doppler's effect occur? This is the car. You are here as the car leaves
7. 7. Why does Doppler's effect occur? • The Doppler effect occurs when a source of waves and the observer are moving relative to each other, resulting in the observer measuring a different frequency of the waves than the frequency that the source is emitting. • The phenommenon is named for the Austrian physicist Christian Doppler (who first described it).
8. 8. Three scenarios • stationary source, moving receiver • stationary receiver, moving source • moving source and receiver
9. 9. Three scenarios • stationary source, moving receiver • stationary receiver, moving source • moving source and receiver All can be concluded in one formula
10. 10. • fr and fs: frequency of receiver and source • vr and vs: speed of receiver and sourcer • v: speed of sound in air
11. 11. Questions Assume you are Sitting on a beach one day. You find a flight is moving towords you with speed of 100m/s. What frequency will you hear as the plane flying towards you which engine emiting sound with a frequency of 1000 Hz?
12. 12. solution
13. 13. • What if the plane is leaving?
14. 14. • What if the plane is leaving?
15. 15. Resources • http://www.physicsclassroom.com/class/sound/Lesson-3/The- Doppler-Effect-and-Shock-Waves
• #### whilpert

Jun. 8, 2015

Doppler's effect lo5

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