# Attenuation of em waves- unknown relationship help.

1. Apr 23, 2013

### Random999

Sorry if this is in the wrong place. Was not sure what it is categorised as.

I have come across the following:$e^{-\frac{\omega}{c} nkz}$, referring to attenuation of a wave.

It was found here:

http://www.astarmathsandphysics.com/university_physics_notes/optics/university_physics_notes_propagation_of_electromagnetic_waves_in_a_conducting_medium.html

I have been unable to find this anywhere else. I was wondering if anyone else has seen it before and if so where I may find more info about it. Is anyone able to suggest what the symbols represent?