From class today

http://plasticity.szynalski.com/tone-generator.htm

https://www.youtube.com/watch?v=V-HESnYSmmE
(Thanks, Ian!)

Related questions from today's class on the Doppler effect:

1.  What is the Doppler effect?

2.  An ambulance is coming toward you, with a siren blasting a 1000 Hz tone.
a.  As it approaches you, what will be true of the frequency of the sound YOU hear?
b.  After it passes you, what will be true of the frequency of the sound YOU hear?
c.  What is true of the frequency of sound that the ambulance drivers hear?

2.  Be sure to review the websites shown in class.  Remember that the Doppler effect has to do with frequencies, NOT volumes of waves.

3.  What is a red shift?  What is a blue shift?


Also - questions from earlier material (before we did waves):

1.  What is the Bernoulli principle?

2.  Explain the general principle behind why airplanes fly.

3.  In general, what is energy?