[Phys-L] Re: An Interesting reflection phenomenon

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 10:53 PM 4/17/2005, you wrote:
> ///
> The backdrop was plain white and pretty smooth and the tympani
> happened to be placed where I could see a reflection of the
> drum-heads in the backdrop. The orchestra was brightly illuminated
> from above. When the timpanist would strike one of the drums, the
> reflection in the backdrop would clearly show the nodal pattern on
> the drumhead--the nodes being bright and the anti-nodes being dark.

///

> Hugh Haskell


Here's the $64 question: the nodes as you observed them: which ones
  were they? a breathing mode? a quadrantal mode? Higher?

I am going to suppose that you possibly saw a mode that was
bilaterally symmetrical, associated with a near parallel light beam
path to you from the drum heads.


Brian Whatcott    Altus OK    Eureka!
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