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A couple more asides. NGC recently repeated Light Fantastic, one hour. 
It does that on occasion, and is well worth watching. One of the points 
the host makes is about what we know about light. From decades ago, and 
maybe even presently, some science lecturer will ask the question, "Do 
you know what light is?"  Invariably, someone or more will innocently 
raise their hands. At that point, the lecturer will embarrass them all 
by declaring that none of the great scientific minds do, and then go 
onto some subject light spectra. However, thankfully, the host of Light 
Fantastic demolishes that question by explaining what we do know about 
that subject.

I fun thing to do with the Doppler shift is to find a hollow plastic 
ball that you can attach a string tightly. You want the ball to be 
hemispherical with two halves. Put a 3 volt battery in it and attach a 
Piezo crystal (Radio Shack?) across its leads, and put it inside the 
ball. The crystal will be emitting a sound. Tape the ball securely 
together, then swing it around your head. Anyone standing outside your 
circle of rotation will hear the Doppler effect.

-- 

           Wayne Watson (Watson Adventures, Prop., Nevada City, CA)

             (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
              Obz Site:  39° 15' 7" N, 121° 2' 32" W, 2700 feet
            
                 "We are operating this planet like a business in
                  liqudation." -- Al Gore, 2006
            
                    Web Page: <www.speckledwithstars.net/>

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