The ir remotes I have measured are about 925 nanometers,
Michael Thomason, Director of Physics Learning Laboratories
University of Colorado Boulder Department of Physics
303-492-7117
thomason@colorado.edu http://physicslearning.colorado.edu
-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Anthony Lapinski
Sent: Friday, November 04, 2011 1:43 PM
To: tap-l@lists.ncsu.edu; phys-l@carnot.physics.buffalo.edu
Subject: [Phys-l] remotes
I'm teaching about EM waves in astronomy and atmospheric absorption. I use
a remote control, solar cell, and Radio Shack amp/speaker to show that
remotes give IR pulses. These waves are partially blocked by a black
plastic bag and almost totally blocked by white paper or aluminum foil.
They go right through wax paper, clear plastic, and a metal screen.
Does anyone know the frequency (wavelength) range for typical remote
controls (for radios, TVs, DVD players, etc.)?
On a related note, my car remote pulses go through walls. Are these waves
similar to those for remotes I mentioned earlier, or is it in a different
part of the EM spectrum? I have not tried my shields with my car remote
yet.
Any other demos that can be done with these remotes?