Penetration and freq
Penetration is not just about energy, it is also about the properties of the material, and the various modes of interaction between electromagnetic radiation and matter. Each material has a particular absorption and reflection spectrum because of this. Low frequency EM radiation is highly penetrating as the photons do not.
Description:John Rennie k Hi John, my question was specifically in reference to [this link] fbcdn-sphotos-a. There is a permeable region in the low frequency area. The confusion is between air and solid objects, which react to EMR differently. Hasn't research been done to quantify this behaviour for different EMR and different objects?