Re: [Phys-l] heat labs?

["Kilmer, Skip" <kilmers@greenhill.org>]

I do a similar lab, but run it twice: once in clear water and once in water with black India ink powder. The first time most of the light gets out, while most of the IR is absorbed. The second time both light and IR are absorbed. It makes a good case against using incandescent lamps for lighting. (although they are good heat sources)
Skip Kilmer
Greenhill School

-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Richard Taylor
Sent: Saturday, August 25, 2007 8:25 AM
To: Forum for Physics Educators
Subject: Re: [Phys-l] heat labs?

You might try this:

http://home.hockaday.org/HockadayNet/Academic/physics/MPPhysics/labs/
bulbtemp.html

It uses a 15 watt light bulb for the immersion heater. With a known
power, you don't have to use volts and amps.

There's the added benefit of it seeming really scary.

   Richard
--
Richard L. Taylor
The Hockaday School
Dallas, TX  75223
http://home.hockaday.org/HockadayNet/academic/physics/