how to found what type of medium

[halee awan]

here is the equation E=10cos (10^8t-3y)

by this how i can found what type of medium it is

if ur ans is follow the formulla of loss of tangent

that is given below tan(α)=conductivity (δ)/w*epsilon

then how i can foud conductivity (δ) by above equation[/GVideo]

 

[Fahmy]

this equation shows constant amplitude with no attenuation, the medium shall be losless. It must be an insulating medium