MOD 4 LECTURE 1                    THE ELECTROMAGNETIC SPECTRUM  - EMS

In this lecture you will:

"The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation.[1] The "electromagnetic spectrum" of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.

The electromagnetic spectrum extends from below frequencies used for modern radio to gamma radiation at the short-wavelength end, covering wavelengths from thousands of kilometers down to a fraction of the size of an atom. The long wavelength limit is the size of the universe itself, while it is thought that the short wavelength limit is in the vicinity of the Planck length, although in principle the spectrum is infinite and continuous." cite: wikipedia

The EMS is pure energy. 
All parts of it travel at the "speed of light" in a vacuum. 
This energy is produced by changes in the energy state electrons and the higher ionizing radiation by events in the nucleus of atoms. Most of the energy the Earth "runs on" is created by the Sun.  


http://imagers.gsfc.nasa.gov/ems/radio.html
http://weloveteaching.com/arsc10/ems/EMS.html
It is more important to know where the waves are relative to each other. From the links above and others you google,  make a table of the areas of the EMS and the functions they can be used for.  In the approximate length column try to find something, like a breadbox or an dime or something else solid and visual to represent the size.  How many feet is a meter? 
Name of wave Uses of wave  Approximate length 
ELF    
VHF    
UHF    
MICRO    
IR    
VIS    
UV    
XRAY    
GAMMA RAY