Ok people. I cannot try this because I have cannot bend over the bathtub
(recovering from some surgery) It would be better in a swimming pool but I
do not have one and it is well below zero outside right now anyway.
I fully realize that sound waves are not the same as waves in water but I
think they might at least illustrate what is going on. These are of course
2 dimensional waves and the molecules of water are moving differently than
sound waves and sound is three dimensional but if you hold the parabola hal=
f
submerged you might get the idea of what is going on. At least you are
getting the idea of a longitudinal wave as opposed to what we picture as
electromagnetic radiation
Get your parabola ( remove the mic!!) find your rubber ducky and splash
away. Send one wave (simulating a very very very very low sound ) at the
parabola and see if it disappears (it won't). Would be even better to try
this in a swimming pool if you need convincing.
Barb Beck
Edmonton
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