SMDEP Physics Oscillations Waves Any trumpet players in
- Slides: 8
SMDEP Physics Oscillations, Waves Any trumpet players in the house? Please see me after class today. Webpage updated: http: //www. astro. yale. edu/krines/smdep
Quiz Results • Pre-quiz and Post-quiz to measure change • Pre-quiz mean: 8. 6 (max: 24) • Post-quiz mean: 15. 7 (max: 29) – This change is larger than most semesterlong, lecture-based courses – You all did it in 11 days! • Individual Pre/Post scores available at end of class
Ch 15, #2: AM radio wavelength? 1. 2. 3. 4. 5. 6. 200 -550 km 200 -550 m 20 -55 m 2 -5. 5 mm Other Didn’t finish
Ch 15, #2 b: FM radio wavelength? 1. 2. 3. 4. 5. 6. 2. 8 -3. 4 km 0. 29 -0. 36 m 28 -34 m 2. 8 -3. 4 m Other Didn’t finish
Ch 15, #12: ratio of amplitudes? 1. 2. 3. 4. 5. 6. 2 21/2 4 81/2 Other Didn’t finish
A mass attached to a spring oscillates back and forth as indicated in the position vs time graph below. At point P the mass has: 1. 2. 3. 4. 5. Positive velocity and positive acceleration Positive velocity and negative acceleration Positive velocity and zero acceleration Negative velocity and positive acceleration Negative velocity and negative acceleration x P t
1. 2. 3. 4. 5. The picture below is a top view of ripple waves made by a water bug moving on the surface of a lake. From the wave pattern, we can see that the bug has been moving: Continuously to the left Continuously to the right Back and forth, first right then left Back and forth, first left then right In a circle
If the frequency of a wave in a medium is increased, how does the velocity of the wave change? 1. It increases 2. It decreases 3. It stays the same
