1. 1. Doppler Effect
Change in frequency of a wave due to relative motion between source and observer.
A sound wave frequency change is noticed as a change in pitch.

2. Stationary Sound Source
Moving Sound Source
Direction of movement
Expanded = lower frequency
Compressed = higher frequency

4. Doppler Effect for Light Waves
A light wave change in frequency is noticed as a change in “color”.
The Doppler Effect will cause shifts in frequency causing color shifts as:
Object coming toward = Blue Shift
Object moving away = Red Shift

7. c = l f 5. Speed of Light c = l f
speed of light = wavelength x frequency
c = 300,000,000 m/s
A radio station broadcasts a radio wave with a wavelength of 3.0 meters. What is the frequency of the wave?
c = l f
= 100,000,000 Hz

8. Complete #6 practice questions
Complete p. 4-7 Virtual Lab