Campton Scattering: Colour Change Explained

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Discussion Overview

The discussion revolves around the phenomenon of Compton scattering and its relationship to color change, specifically questioning whether a change in frequency or wavelength during scattering results in a perceivable change in color. The scope includes conceptual understanding and technical reasoning related to light and color perception.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant asserts that color is defined by frequency/wavelength and questions why a change in these parameters would not result in a color change during Compton scattering.
  • Another participant corrects the spelling of "Compton" and argues that light remains light regardless of its source, implying that color change should occur.
  • A different participant challenges the notion that color is solely defined by frequency/wavelength, suggesting that color perception is subjective and can vary between individuals with different eyesight.
  • Further elaboration is provided on color perception, noting that most colors perceived are a combination of multiple wavelengths and that human eyes are not precise spectrometers, which affects color differentiation.
  • One participant raises a question about the extent of frequency change that can occur during Compton scattering, indicating a lack of readily available data for optical photons and suggesting that further investigation is needed.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between frequency/wavelength changes and color perception, with no consensus reached on whether Compton scattering results in a perceivable color change.

Contextual Notes

There are limitations regarding the assumptions made about color perception and the lack of specific data on frequency changes in Compton scattering for optical photons.

Zaya Bell
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Colour is defined by frequency/wavelength. Hence whenever they both change, we are to observe a change in colour. But that isn't the case for campton scattering. Or is it?
 
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I assume you mean Compton, and why wouldn't it be? Light is light, no matter how it was produced.
 
Zaya Bell said:
Colour is defined by frequency/wavelength.

not really
colour is a very visual / personal perspective thing ... that is 2 people with different eyesight could see the same freq/wavelength as different colours

V50 answered the rest
 
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Zaya Bell said:
Colour is defined by frequency/wavelength.
This is a question with two parts.
Perception: Most 'colours' we perceive are made up of a number of different wavelengths. Our eyes are pretty lousy spectrometers - because that would give us no evolutionary advantage and there are no naturally occurring monochromatic sources that ancient humans would (want to) see.
Our perception of colour change is not particularly acute. A just noticeable difference is in the order of 1% change in chromaticity. Any method of producing a 1% change for comparing with an unchanged reference colour would, presumably be detected by an observer under 'reasonable viewing conditions.

Generation: It is difficult to produce big changes of frequency of a beam of light. Have you found out what sort of percentage frequency change that Compton scattering can produce? In my cursory search on Google, I could only find actual figures for higher energies than optical photons. I am sure some PF member will have a better clue about that.
 
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