Speed of wave vs the wave emitter:
https://physics.bu.edu/~duffy/HTML5/doppler.html
Doppler effect:
https://www.youtube.com/watch?v=pJKlTM2bINY
Big Bang Theory clip
https://www.youtube.com/watch?v=Tn35SB1_NYI
Frequency generator:
http://onlinetonegenerator.com/
Mach # and speed of sound (sonic boom):
http://www.youtube.com/watch?v=GstwLblPpIM
Double boom from booster reentry:
https://www.youtube.com/watch?v=VBlIvghQTlI
Figure 1: subsonic aircraft
Figure 2: supersonic aircraft
Nozzle:
subsonic
https://www.youtube.com/watch?v=gzeH06MC9kw (3:20 WOW!!!! over 8900 views??)
supersonic
https://www.youtube.com/watch?v=DKtVpvzUF1Y (2min in)
Wave superposition:
https://docs.google.com/document/d/1ljKKcRn_okezEgKasSTEdPNqiON-EJSLqWTjcw4MjxY/edit?usp=sharing
Understading beats:
http://goo.gl/0rIxEz
Resonance and the Tacoma narrows Bridge
http://www.youtube.com/watch?v=lXyG68_caV4
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