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DOPPLER'S EFFECT
PHYS 101 LO5
Real Life Experience
• You must have noticed this before. As the train approaches the
station, the sound of its horn at a ...
Real Life Experience
• You must have noticed this before. As a train or a car approaches,
the sound of its horn is at a hi...
Why does Doppler's effect
occur?
• Click here for a passing car horn
You are
here as the
car
approaches
↑
This is the car.
Why does Doppler's effect
occur?
• Click here for a passing car horn
You are
here as the
car
approaches
↑
This is the car.
Why does Doppler's effect
occur?
This is the car.
You are
here as the
car leaves
Why does Doppler's effect
occur?
• The Doppler effect occurs when a source of waves and the
observer are moving relative t...
Three scenarios
• stationary source, moving receiver
• stationary receiver, moving source
• moving source and receiver
Three scenarios
• stationary source, moving receiver
• stationary receiver, moving source
• moving source and receiver
All...
• fr and fs: frequency of receiver and source
• vr and vs: speed of receiver and sourcer
• v: speed of sound in air
Questions
Assume you are Sitting on a beach one day. You
find a flight is moving towords you with speed
of 100m/s. What fr...
solution
• What if the plane is leaving?
• What if the plane is leaving?
Resources
• http://www.physicsclassroom.com/class/sound/Lesson-3/The-
Doppler-Effect-and-Shock-Waves
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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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