Understanding Light: Questions & Answers

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Discussion Overview

The discussion revolves around various questions and concepts related to light, including its emission, propagation, interaction with matter, and its dual nature as both a wave and a particle. Participants explore theoretical aspects, experimental implications, and conceptual clarifications regarding light's behavior and properties.

Discussion Character

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

Main Points Raised

  • Some participants inquire whether light is emitted orthogonal to the electron's movement or at the angle of absorption, questioning the relationship between electron transitions and light propagation.
  • There are questions about whether light from reflective surfaces is absorbed and re-emitted or simply reflected, and whether energy is lost in this process.
  • Concerns are raised regarding the modulation of emitted light's wavelength and the differences in emission between ionized and neutral atoms.
  • Participants discuss the nature of electromagnetic waves, including how electric and magnetic components arise from electrons and how they interact to form light.
  • Questions are posed about the visualization of light in three dimensions and its polarization, as well as the relationship between amplitude, intensity, and individual photons.
  • Some participants express skepticism about the applicability of Bohr's model to these questions, suggesting a need for a deeper understanding of quantum mechanics.
  • There is mention of phenomena like Compton scattering and gravitational redshift in relation to energy loss of photons.

Areas of Agreement / Disagreement

Participants express a range of views, with some agreeing on the basic principles of light emission and propagation while others challenge the adequacy of classical models like Bohr's. The discussion remains unresolved on several points, particularly regarding the nature of light and its interactions.

Contextual Notes

Participants acknowledge limitations in their understanding of advanced topics such as quantum electrodynamics (QED) and the mathematical frameworks required to fully grasp the behavior of light.

Who May Find This Useful

This discussion may be of interest to those studying physics, particularly in the areas of optics, quantum mechanics, and electromagnetism, as well as anyone curious about the fundamental nature of light.

  • #31
Padremo, since you posted the feynman lectures, could you help me with my questions about them and/or the other topics as well? Any help will be appreciated. Thank you.
 
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  • #32
GRB 080319B -- Once again, let me suggest that to answer your questions, and for you to understand the answers is an exercise of three years of study -- two if you are really quick. That is to say, you will need to understand and master most of Jackson's E&M text, and then master a basic course in QM, and then master an introductory course in quantum electrodynamics. Look at it as: the answers to your questions will take several hundred pages of text. For the level of specificity you request, there are not any short cuts. That's life in the physics world. (If you don't understand thermal radiation, then you are in trouble, and thus you need a course or book on the physical phenomena that lead to quantum theory -- often advertised a a beginning course in atomic physics -- like Planck and Einstein and Bohr. If you do not have a good grasp of the basic atomic physics involved, you will never understand light.

Good luck,.
Reilly Atkinson
 
  • #33
reilly said:
GRB 080319B -- Once again, let me suggest that to answer your questions, and for you to understand the answers is an exercise of three years of study -- two if you are really quick. That is to say, you will need to understand and master most of Jackson's E&M text, and then master a basic course in QM, and then master an introductory course in quantum electrodynamics. Look at it as: the answers to your questions will take several hundred pages of text. For the level of specificity you request, there are not any short cuts. That's life in the physics world. (If you don't understand thermal radiation, then you are in trouble, and thus you need a course or book on the physical phenomena that lead to quantum theory -- often advertised a a beginning course in atomic physics -- like Planck and Einstein and Bohr. If you do not have a good grasp of the basic atomic physics involved, you will never understand light.

Good luck,.
Reilly Atkinson

Thank you very much for your advice reilly. I am going to study this topic in-depth and refrain from posting questions whose answers I wouldn't understand without a substantive foundation. I apologize for not listening to your help the first time. I will leave this thread open for anyone else to post their questions.

Thank you all for your help.
 

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