ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************

Cool!  It sounds like the salt and pepper was lining up in the places
where the plastic wrap was not shaking very much.  Those places are
called nodes.  The salt and pepper was getting bounced out of the places
where the plastic was shaking up and down a lot (the anti-nodes).  

There are some really cool kits that are available that show this
stuff...they're called chladni plates.  Pasco (and many others) sell
them, and, they come in all different shapes and sizes.  Here are some
websites to check out:

http://www.youtube.com/watch?v=EprMFajNzfQ&mode=related&search=
http://www.phys.unsw.edu.au/jw/chladni.html

Phil

-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Thursday, March 08, 2007 10:44 AM
To: [log in to unmask]
Subject: why did this happen?

ISEN-ASTC-L is a service of the Association of Science-Technology
Centers
Incorporated, a worldwide network of science museums and related
institutions.
************************************************************************
*****

In an attempt to show that sound vibrations can move objects, I put a
bit  of 
salt and pepper  on a piece of plastic wrap which was stretched  tight
over 
the top of an aluminum can.  I then held a metal cookie  sheet a few
inches 
above the wrap, and whacked it with a metal spoon.   Indeed, the salt
and pepper 
jumped!
 
I then continued to whack the cookie sheet ten more times, and the salt
and  
pepper started to line up in rows!  When I was done, I had three or four
neat 
lines of salt and pepper on my plastic wrap.
 
Were the salt and pepper bits lining up based on the frequency of the  
vibrations I was creating?  Or was something else going on?
 
Thanks so very much!
 
Lisa  

 
Lisa Jo Rudy, Writer/Consultant
625 Chelten  Hills Drive
Elkins Park, PA 19027
_www.lisarudy.com_ (http://www.lisarudy.com/) 
215-635-9735

_About  Guide to Autism_ (http://www.autism.about.com/) 






<BR><BR><BR>**************************************<BR> AOL now offers
free 
email to everyone.  Find out more about what's free from AOL at 
http://www.aol.com.

***********************************************************************
More information about the Informal Science Education Network and the
Association of Science-Technology Centers may be found at
http://www.astc.org.

The ISEN-ASTC-L email list is powered by LISTSERVR software from L-Soft.
To learn more, visit
http://www.lsoft.com/LISTSERV-powered.html.

To remove your e-mail address from the ISEN-ASTC-L list, send the
message  SIGNOFF ISEN-ASTC-L in the BODY of a message to
[log in to unmask]

***********************************************************************
More information about the Informal Science Education Network and the
Association of Science-Technology Centers may be found at http://www.astc.org.

The ISEN-ASTC-L email list is powered by LISTSERVR software from L-Soft. To learn more, visit
http://www.lsoft.com/LISTSERV-powered.html.

To remove your e-mail address from the ISEN-ASTC-L list, send the
message  SIGNOFF ISEN-ASTC-L in the BODY of a message to
[log in to unmask]