EM wave penetration through walls....

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Discussion Overview

The discussion centers around the factors influencing the penetration of electromagnetic (EM) waves through various materials, exploring concepts such as transparency, conduction, and the role of atomic orbitals. Participants examine why certain frequencies can penetrate walls while others cannot, with examples including FM radio and visible light.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants propose that the ability of EM waves to penetrate materials is related to the material's conduction properties at specific frequencies.
  • Others argue that the concepts of transparency, translucency, and opacity are more relevant to understanding wave penetration than conduction alone.
  • One participant questions whether the penetration of radio waves through walls is due to their long wavelength and suggests diffraction as a possible explanation.
  • There is a discussion about how atomic orbitals might influence wave penetration, although the exact relationship remains unclear.

Areas of Agreement / Disagreement

Participants express differing views on the primary factors affecting wave penetration, with no consensus reached on whether conduction or other properties like transparency are more significant. The discussion remains unresolved regarding the specific mechanisms at play.

Contextual Notes

Limitations include a lack of clarity on the definitions of terms like conduction in this context, as well as the need for further exploration of the relationship between atomic structure and EM wave behavior.

mktsgm
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What are the factors that determine the property of wave penetration of bodies? For instance we can listen to fm radio from inside the walls of a room. But visible light is unable to penetrate the walls.

Similarly some metals reflect some frequency but absorb some. How atomic orbitals play role in wave penetration?
 
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mktsgm said:
What are the factors that determine the property of wave penetration of bodies? For instance we can listen to fm radio from inside the walls of a room. But visible light is unable to penetrate the walls.

Similarly some metals reflect some frequency but absorb some. How atomic orbitals play role in wave penetration?
Conduction?

EDIT -- Conduction as a function of frequency.
 
berkeman said:
Conduction?

EDIT -- Conduction as a function of frequency.
Seems to me more like transparency / translucency / opacity than conduction (of course, I'm an EE so I think of conduction in a particular way). Glass is transparent to visible light waves, non-metallic walls are transparent to radio waves, etc. WHY things are transparent/opaque is of course still the real question.
 
phinds said:
WHY things are transparent/opaque is of course still the real question.
Isn't that related to the conduction of the material at the frequency of the incident EM? I certainly could be wrong...
 
berkeman said:
Isn't that related to the conduction of the material at the frequency of the incident EM? I certainly could be wrong...
I actually don't know anything about the conductivity of materials to incident EM waves, just of internal current flow (and that kind of conductivity does vary with frequency), and you certainly could be right.
 
mktsgm said:
What are the factors that determine the property of wave penetration of bodies? For instance we can listen to fm radio from inside the walls of a room. But visible light is unable to penetrate the walls.

Similarly some metals reflect some frequency but absorb some. How atomic orbitals play role in wave penetration?

Question: how do you know that the radio waves were able to penetrate through the walls? How do you know that it isn't due to the long wavelength of radio waves when compared to visible light, i.e. simple diffraction?

Zz.
 
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