1. Doppler Effect

2. The change in frequency due to motion
The source or the receiver can be moving

4. Since both objects are at rest (v=0 m/s), there is no change in frequency.

5. Since both objects are at rest (v=0 m/s), there is no change in frequency.
For Sound, Pitch is same at any point.

7. Object is moving towards the right, so the frequency changes.
Frequency Decreases, Wavelength longer
Speed of the wave stays constant
Frequency Increases, Wavelength Shorter

8. Lower Pitch Higher Pitch
Object is moving towards the right, so the frequency changes.
Frequency Decreases, Wavelength longer
Speed of the wave stays constant
Frequency Increases, Wavelength Shorter
Higher Pitch

14. Remember, it can be either the sound source (previous ex) or the listener moving

15. 1 Fish, 2 Fish, Red Fish, Blue Fish
Blue shift
Increase in Frequency
Red shift
Decrease in Frequency

16. Blue Shift
Red Shift

17. I see the Light Red/Blue shift comes from Astronomy
This shows light frequency
(color) which is Red Shifted

19. Which way is the object sound source moving?
Where is the higher frequency?
Where is the lower frequency?

20. The Many Uses of Doppler
Radar (RAdio Detection And Ranging)
-speeding, air traffic control, weather
SONAR (SOund NAvigation and Ranging)
Medical
-Echocardiogram – velocity of blood flow
-Doppler Ultrasound – detects fetal heart tones