Re: Breaking Glass with Sound

["Prof. John P. Ertel" <jpe@NADN.NAVY.MIL>]

But aren't beakers expensive?  Our Chemistry Dept. says that they pay
about $18.00 each for the 500ml and $14 each for the 150ml size.  "Cheap
water goblets cost about $5.00 each at most.



Ron Ebert wrote:
> At 05:53 AM 6/2/99 -0400, Prof. John P. Ertel wrote:
>
> >  But here is what I can say with certainty:
> >
> > 1.  Don't try a beaker!  While they are generally of a cylindrical nature
> > which makes the calculation of their Helmholtz resonance modes quite easy,
> > BUT they have this horrible anisotropy in the lip for pouring --- also,
> > the lip curves somewhat outward.  If that wasn't enough, they are made of
> > Pyrex --- a material that has a great deal of resistance to fracture (and
> > therefore, a great deal of internal loss).
>
> Pyrex beakers are all we ever use, and we have a 100% success rate with
> them. In case you missed it the first time around, our demo write-up is at
> http://phyld.ucr.edu/Sound%20&%20Wave%20Motion%201/S-118G.htm.
>
> If you are ever in southern California, come by and I'll breaker however
> many beakers you like in our sound chamber (well, as many as I have in hand
> in stock :))
>
> Ron Ebert
> UCR Physics Department
> ron.ebert@ucr.edu
> http://phyld.ucr.edu

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