[YAPA] Fwd: Physics Teacher Demo's Spiral Rainbow
Richard Zitto
rjzitto at ysu.edu
Tue Feb 20 11:11:45 EST 2007
This is Z's sharing for the meeting Wednesday at Gordon's Digs.
See you all in March. If this does not come through go to Arbor
Scientific to see it. Really neat and needs to be set up. Z
Arbor Scientific wrote:
><html><body>
><table id="table1" style="BORDER-COLLAPSE: collapse" width="600"
border="1"><tbody><tr><td align="center" colspan="2"><p
style="MARGIN-TOP: 10px; MARGIN-BOTTOM: 10px"><img height="59"
hspace="10" src="http://www.arborsci.com/CoolStuff/EmailLogo.jpg"
width="200" align="left" border="0" /><strong><font
face="Arial">Demonstrating Rayleigh Light Scattering</font>
> </strong>
></p>
><p style="MARGIN-TOP: 10px; MARGIN-BOTTOM: 10px"><strong><font
face="Arial" size="5">The Spiral Rainbow</font>
> </strong>
></p>
></td>
></tr>
><tr><td bordercolorlight="#ffffff" width="50%"
bordercolordark="#ffffff"><p style="MARGIN: 10px"><strong><font
face="Arial" size="2">February 14, 2007</font>
> </strong>
></p>
><p style="MARGIN: 10px"><font face="Arial" size="2">Recently, Arbor
Scientific was invited to participate at the Focus/DMAPT Saturday
Physics meeting at the University of Michigan. The theme of the session
was concerning optics and the U of M Focus group had some of their best
and brightest sharing demo ideas with high school physics teachers from
the surrounding area.</font>
> </p>
><p style="MARGIN: 10px"><font face="Arial" size="2">Prof. Roy Clarke of
the University of Michigan Physics Department was discussing
polarization and shared this cool demo of <em>Rayleigh Light
Scattering. </em>
>We reproduced the demo here at our office with great results and we
wanted to share this with our CoolStuff ohysics subscribers.</font>
> </p>
><p style="MARGIN: 10px" align="center"><img height="168"
src="http://www.arborsci.com/CoolStuff/RayleighExample.jpg" width="250"
border="0" /></p>
><p style="MARGIN: 10px 20px"><em><font size="2">Rayleigh scattering
causing a reddened sky at sunset.</font>
> </em>
></p>
><p style="MARGIN: 10px"> </p>
></td>
><td bordercolorlight="#ffffff" align="center" width="50%"
bordercolordark="#ffffff"><img height="400"
src="http://www.arborsci.com/CoolStuff/RayleighDemo.jpg" width="207"
border="0" /><p style="MARGIN: 10px" align="left"><em><font
size="2">The Spiral Rainbow: This demonstration allows students to see
the optical path of polarized light through an optically active
solution.</font>
> </em>
></p>
></td>
></tr>
><tr><td bordercolorlight="#ffffff" bordercolordark="#ffffff"><img
height="236" src="http://www.arborsci.com/CoolStuff/ReleighSetup.jpg"
width="250" border="0" /><p style="MARGIN-LEFT: 10px; MARGIN-RIGHT:
10px"><font size="2"><em>Halogen light source and an inexpensive glass
vase from Target. Polarizing filter is placed on top between the
container and your light source.</em>
> </font>
></p>
></td>
><td bordercolorlight="#ffffff" bordercolordark="#ffffff"><p
style="MARGIN: 10px"><strong><font face="Arial" size="2">Demo Materials
and Setup:</font>
> </strong>
></p>
><p style="MARGIN: 10px"><font face="Arial" size="2">Bright white light
source (ours is a halogen lamp like those used in track lighting)<br
/>Tall glass cylinder (ours is a 30cm tall flower vase)<br />Linear
polarizing film<br />Cardboard<br />Corn syrup to fill cylinder<br
/><br />Fill the cylinder with corn syrup, pouring slowly to reduce
bubbles. (Pouring well in advance will allow bubbles to escape.) Cut a
hole in the cardboard, the same size as the top of the cylinder.
Place polarizing film over the top of cylinder. Then place cardboard on
top of cylinder, to shield extra light. Shine light directly down into
cylinder. Turn out the room lights and view from 6 to 8 feet away!<br
/> </font>
> </p>
><p> </p>
></td>
></tr>
><tr><td bordercolorlight="#ffffff" bordercolordark="#ffffff"
colspan="2"><p style="MARGIN: 10px"><font face="Arial" size="2">This is
a great demo to show students when discussing polarized light. For an
explanation on Rayleigh's theory of Light Scattering try these links:
<a
href="http://clickmeter.dundee.net/t/24510905/32112686/69688/0/">http://
en.wikipedia.org/wiki/Rayleigh_scattering</a>
> Journal of Chemical Education <a
href="http://clickmeter.dundee.net/t/24510905/32112686/69689/0/">www.che
m.ufl.edu/~kschanze/outreach/d5.pdf</a>
> </font>
></p>
><p style="MARGIN: 10px"><font face="Arial" size="2"><strong>About the
photo: </strong>
>The image above was taken with a digital camera in a darkened room. The
room lights were on while setting the exposure time and focus on the
vase. On a digital camera this is done by pressing the shutter button
half way down to focus. While holding the button in the focused
position, the lights are then turned off and the light above the vase
is turned on as the only light source. Then the shutter button is
depressed completely to get the photo. This takes a little practice and
helper coordination, but can be accomplished by a couple handy
students.</font>
> </p>
><p style="MARGIN: 10px"><font face="Arial" size="2">For more
demonstrations and activities like be sure to checkout the CoolStuff
Newsletter achive at: <a
href="http://clickmeter.dundee.net/t/24510905/32112686/3333/0/">http://w
ww.arborsci.com/CoolStuff/Archives.htm</a>
> </font>
></p>
><p style="MARGIN: 10px" /></td>
></tr>
><tr><td bordercolorlight="#ffffff" bordercolordark="#ffffff"
colspan="2"><p align="center"><font face="Arial"><span
style="FONT-SIZE: 9pt">Copyright 2007 Arbor Scientific; All rights
reserved.</span>
> </font>
></p>
><p align="center"><font face="Arial"></font>
></p>
></td>
></tr>
></tbody>
></table>
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--------------------------------------
R J Zitto Physics Instructor
Youngstown State University
Physics & Astronomy Dept
Youngstown, OH 44555
Office 330 941 7110 fax 330 941 3121
cell 330 550 3652
rjzitto at ysu.edu
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