As ground waves has the properties of dispersion and can reach anywhere by avoiding objects. sky waves use the reflection from ionosphere for propagation. space waves use the concept of line of sight. I want to know the detailed information about the penetration power of EM waves as ground waves, sky and space waves are em waves. so can em wave penetrate only conductor or to others object also? and as we know the frequency will be high so the energy in wave will be high. is there any relation of energy to the penetration?
Electromagnetic waves can not penetrate only into an ideal conductor with depth of the skin layer strictly zero. Being an idealized abstraction, we can assume that there is no object in which electromagnetic waves do not penetrate. The penetration power on the layer is (1 / e) of the incident power and can be obtained from this proportion at any distance for simple materials in the absence of relaxation processes in it.
It is necessary to determine what energy is involved. If the photon energy is, then such a dependence is and is determined with or without scattering from the position of light pressure. If we talk about electrostatic energy in a closed volume outside or inside the medium, then such a dependance can be obtained by asymptotic transition of the closed volume goes to zero.
I think to find this information in open sources can be easily.
Kirill Zeyde Rahul Dev Mishra I think you both have a bit of a misunderstanding.
1) The question is talking about the HF (3-30MHz) radio band, which, depending on frequency can be reflected by the ionosphere. This would correspond to the 10^-9 to 10^-7 eV range.
2) The penetration depth would highly depend on the material being penetrated and more specifically its conductivity. It will also depend on whether you're referring to a depth before which it is reflected or a depth before which it is absorbed.
This problem concerns the propagation property of EM in media. It is related with both the wave frequency ω and medium property, which is described by three parameters, μ (the magnetic permeability), ε (the electric permittivity) and σ (the electrical conductivity). Generally, the larger σ, the shorter penetration depth.
Penetrating capacity of light waves increases as frequency increases; and penetrating capacity of radio waves (or cell phone waves) increases as frequency decreases. See end of the reference: https://b-ok.cc/book/3630085/dd3a30
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