Sun Icon

Communication - Vibration, Electronic Signals, and Electromagnetic Radiation

by Regan Lum
1995 The Regents of the University of California

Wave Image


The main methods of communication are speaking and listening. One of the limitations of communication through speech is that the listener must be within shouting distance. Through the miracle of science, we can speak to a friend that is far away by sending our voice through the air, wire, or glass fiber in the form of electromagnetic radiation or electronic signals. We can even speak to machines and tell them what to do.


Students will be able to:

Unit Details

For More Details On This Unit Go to


Lesson Plan


(Last Update: Nov 10, 1995 )

Science On-Line Logo

Mail comments to

All text, images, and other resources in this page are Copyright 1995, The Regents of the University of California. All rights reserved. For permission, email

Education Icon Return to the CEA Science Education Home Page