1. Wave Formula What determines the speed of a wave? A.The source B.The medium C.The energy/amplitude D.The frequency v = f Wave Speed

2. Doppler Effect The apparent change in frequency due to the motion of the source (or receiver) The Doppler effect is applied to ALL waves –Sound –Water –Light –etc

3. No Motion - No frequency change

4. Motion = apparent frequency change Smaller frequency Lower pitch Larger frequency Higher pitch

5. Point Source – Moving Draw this picture How has changed in the direction of motion? is smaller v = f  v does not change f is larger

6. Point Source – Moving How has changed opposite the direction of motion? is bigger v = f  v does not change f is smaller

7. Complete worksheet

8. What happens when source moves faster that the wave?

9. Condensation cloud as an F/A-18 Hornet flys at or near the speed of sound. Photo by John Gay. F/A-18 breaking the sound barrier

10. B-2 Spirit Stealth Bomber. Photo by Bobbi Garcia. Posted here with permission of the AFFTC.

11. F/A 9-Lives ……. super sonic kitty