Charge & Reflection: Explaining What It Means

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    Charge Reflection
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Discussion Overview

The discussion revolves around the statement from the Amasci site regarding the relationship between charge and the reflection of light. Participants explore the nature of charge, its role in light reflection, and the implications of these concepts in different contexts, including the behavior of electrons and hypothetical scenarios involving protons and neutrons.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions the statement that "charge is the stuff that reflects light," expressing confusion about how charges could reflect light.
  • Another participant suggests that while charges interact with electromagnetism, the statement is overly broad and lacks detail, explaining that in metals, incoming light causes surface electrons to oscillate and reradiate energy, resulting in reflection.
  • Some participants assert that it is incorrect to attribute light reflection to "charge" in general, emphasizing that it is specifically electrons that absorb and re-emit photons.
  • A later reply raises a hypothetical question about the behavior of a plasma made up solely of protons and neutrons, questioning whether it would have any effect on light.
  • Another participant connects this inquiry to the nature of dark matter, pondering whether clusters of protons would be unable to radiate electromagnetic radiation.

Areas of Agreement / Disagreement

Participants express disagreement regarding the original statement about charge and light reflection, with some asserting that it is electrons specifically that are responsible. The discussion includes multiple competing views and remains unresolved regarding the broader implications of these ideas.

Contextual Notes

Participants highlight the need for more detailed explanations and the potential limitations of the original statement, particularly regarding the definitions of charge and the specific roles of electrons in light reflection.

Virogen
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The Amasci site makes this statement:

"charge is the stuff that reflects light and makes objects visible..."

Can anyone elaborate on what this means? I cannot think of a way to explain it at all - I don't even understand how charges could reflect light.

Thanks!
 
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Well, charges are pretty much the only things that interact with electromagnetism, so in that sense I guess this is true. It's an awfully broad and sweeping statement, however, and leaves out a lot of details. Anyway for a metal, an incoming beam of light causes the electrons near the surface to oscillate. Acting like little dipoles they reradiate the energy, producing a reflected beam.
 
It's simply wrong. It's not "charge" that reflects light- it is electrons. Electrons absorb a photon, then re-emit it.
 
HallsofIvy said:
It's simply wrong. It's not "charge" that reflects light- it is electrons. Electrons absorb a photon, then re-emit it.

Would a plasma consisting solely of protons/neutrons and no electrons have any effect on light?
 
Does Drakkith's question present suggestion for nature of dark matter? Would pure clusters of protons have no way to radiate any electromagnetic radiation?
 

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