I know about Faraday's cage, and another screens, but I do not understand the physics of this processes. Well, I know that the atoms are almost empty, so there are a lot of free space to em waves to travel, but how does it related with wavelength of em wave, considering the fact that, in classic physics em wave is oscillation of E\B fields strength values, another saying - intensity. I also read that em waves can pass through any non-conductive materials. Why? Non free electrons do not absorb em waves? If yes then ok. But how about conuctors?
Please, explain me the stuff behind this question