Waves and Sound: page 4

AP Physics 2: Sound 4: Beats

• • • Resonance and beats: Tuning Forks http://www.youtube.com/watch?v=aCocQa2Bcuc

    • The 3^rd graph has a different horizontal (time) scale than the 1^st and 2^nd graphs. The 3^rd graph’s time scale is larger (zoomed out) so the wave looked more “squished together” than the waves in 1^st and 2^nd graphs. DrDaveBilliards did this to show how the amplitude of the combined wave changes. For example, the first demo of 500Hz consists of 500Hz waves in all the top 3 graphs, but the 3^rd graph have the wave “squished” because of the different scale. Beat Frequency http://www.youtube.com/watch?v=5hxQDAmdNWE

    • Visualizing Beat Frequencies: http://www.youtube.com/watch?v=I9f6bP3x_yo

AP Physics 2: Sound 5: Doppler Effect

AP Physics 2: Sound 6: Shock Wave

• • You can hear sonic booms in the video. Glenn Pew also explains a few observations in the video. Supersonic Flight, Sonic Booms http://www.youtube.com/watch?v=gWGLAAYdbbc

  • Bull whip sonic boom: Sonic boom visualized by Schlieren photography http://www.youtube.com/watch?v=lbomsOPSSII

AP Physics 2: Sound 7: Shock Wave Problem

AP Physics 2: Sound 8: Multiple Choice Questions