1. Announcements
Homework will be posted online – You must print, complete and submit by Tuesday
Pick up your pop quiz
Exam date posted [3/2]

2. Which Way Did That Thing Go? 5.1.5 Doppler Effect and Sonic Boom

3. Really Cool Doppler Effect Video – The Adlers
Really Cool Doppler Effect Video – The Adlers

4. Phenomenon #5 – Doppler Effect
A source sends out waves in all directions with the same frequency and wavelength.
How the wave is perceived by an observer depends on RELATIVE MOTION of the source and/or observer.

5. Phenomenon #5 – Doppler Effect
Same frame of reference (no relative motion)
FREQ. OBSERVED (FOBS) = SOURCE FREQ.(FSOURCE) A B

6. Phenomenon #5 – Doppler Effect
Getting closer together – FOBS > FSOURCE
… at increasing speed – GETTING HIGHER
… at decreasing speed – GETTING LOWER
Getting farther apart – FOBS < FSOURCE
… at increasing speed – GETTING LOWER
… at decreasing speed – GETTING HIGER B A

7. The Doppler Effect: what does motion do to waves?
The Doppler Effect: what does motion do to waves?

8.
Big Bang Theory

9. Going faster than the speed of sound
Sonic Boom
Going faster than the speed of sound

10. Sonic Boom