Message-Id: <3.0.32.19980301112806.008425f0@pop3.1stlink.net>
Date: Sun, 01 Mar 1998 11:28:09 -0700
To: pinhole@exploratorium.edu
From: The Lahrs <john-jan@lahr.org>
Subject: Experiment of the Week - Got the Red Green Blues
I've been getting the "Experiment of the Week" from Robert Krampf
for a year or so now and it occurred to me that some teachers or
students would probably enjoy being on his mailing list. Each
week the topic is different, but always interesting and easy to
duplicate. His latest Email message is repeated below.
John
>From: KRAMPF <KRAMPF@aol.com>
>Date: Sun, 1 Mar 1998 12:48:03 EST
>Subject: Experiment of the Week - Got the Red Green Blues
>
>Hello and welcome to the Experiment of the Week!
>
>This document may be distributed in any form, as long as there is no charge
>and my name and e-mail address are included. Please forward it to a friend.
>
>This Week's Experiment - Got the Red Green Blues
>
>This week's experiment is a little late, but I have a good excuse. I have
the
>flu. I have been lying here, sleeping and coughing, watching TV and
coughing,
>reading and coughing. Since I could not think of a fun experiment to do with
>coughing, I decided to do one on television.
>
>Look at all the colors on the screen of your television or computer monitor.
>There are millions of different shades and hues, right? Well, actually there
>are only three. Red, green and blue. To see this, you will need:
>
>a color television or computer monitor
>a little water
>
>Dip your finger in the water and put a small drop of water on the TV screen.
>Look at the drop. You should see bright red, green and blue in the drop.
The
>water is acting as a magnifying glass, showing you the tiny phosphor dots
that
>make up the picture.
>
>But wait a minute! How can all those colors come from those three? And I
>remember from first grade that the primary colors are red, blue and yellow,
>not green. The difference lies in what you are mixing to get the colors. In
>the first grade, we were mixing paints and pigments. With the TV, we are
>mixing light. There is a big difference.
>
>When we mix red and green pigments, we get a brownish color, but when we mix
>red and green light, we get YELLOW. If we add all of the pigments together,
>we get black, but if we mix all of the colors of light, we get white. While
>at first this does not make a lot of sense, it gets clearer as we think about
>it. Red pigment looks red because it absorbs the other colors and only
>reflects the red light. If we mix all of the pigments, they soak up all of
>the colors and we get black.
>
>If you are using your computer monitor, you can use your painting program to
>make blocks of different colors and look at them through the water drop, to
>see how each color is produced.
>
>
>****************************************
>
> As always, if you find an interesting experiment that you think would make a
>good Experiment of the Week, e-mail it to me. If I use it, I will
acknowledge
>you in the experiment.
>
>Each week I will e-mail you a new experiment that you can try yourself. I
>look for experiments that are unusual, safe, dramatic, cheap, and fun. Since
>this list includes teachers, parents, science buffs, and students, I will try
>to give you a wide variety of things to try.
>
>Please forward this e-mail to anyone that you think might enjoy it. If you
>received this e-mail from someone else and would like to be on the list, just
>send me an e-mail at krampf@aol.com, asking to be added to the Experiment of
>the Week List. If you ever want off the list, just send me an e-mail
>requesting to be removed.
>
>The first 40 Experiments of this series are available in book form. Send
>$7.00 U.S. to:
>
>Robert Krampf
>5 Willard Dr. Suite 610
>St. Augustine, FL 32086
>
>Check out our web site at:
>http://members.aol.com/krampf/home.html
>
>for information on:
>
>Watt is Electricity, the million volt electric show
>The Nuts and Bolts of Lightning
>Burning Questions, the science of fire safety
>Educational consulting
>Educator workshops
>
>>From Robert Krampf's Science Education Company
>4850 A1A South
>St. Augustine, FL 32084
>(904) 471-4578
>
>
>
>
>
>
>
>
-- * John C. and Jan H. Lahr * * john-jan@lahr.org * * 914 10th Street * * Golden, Colorado 80401 * * (303) 215-9913 * * http://www.lahr.org/john-jan * * http://giseis.alaska.edu/lahr *