Light Wave Theory: Particles, Vibrations & Pass-Through

  • Context: Undergrad 
  • Thread starter Thread starter adjacent
  • Start date Start date
  • Tags Tags
    Light Theory Wave
Click For Summary

Discussion Overview

The discussion revolves around the nature of light waves, exploring whether light consists of particles moving in a specific manner or if it is a wave propagating through a medium. Participants also consider the implications of light passing through materials like glass.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants propose that light is an electromagnetic wave characterized by oscillating electric and magnetic fields, rather than particles.
  • Others argue that photons, while discrete packets of energy, should not be considered physical particles like protons.
  • A participant questions the historical ether theory, suggesting it was based on the belief that waves require a medium for propagation.
  • There is a mention of Maxwell's equations as a framework for understanding electromagnetic waves, though not all participants are familiar with this theory.

Areas of Agreement / Disagreement

Participants express differing views on the nature of light, with some supporting the wave theory and others discussing the particle aspect. The discussion remains unresolved regarding the fundamental nature of light.

Contextual Notes

Some participants indicate a lack of understanding of Maxwell's electromagnetic theory, which may limit the depth of the discussion on the wave nature of light.

adjacent
Gold Member
Messages
1,552
Reaction score
62
I wonder what is actually a light wave.Is the light particles moving straight and vibrating up and down or the medium vibrating up and down?When light pass through glass for example what happens?Does the light particles vibrate or glass medium?
 
Science news on Phys.org
there are no particles, light is an electromagnetic wave, a wave consisting of an electric field and a magnetic field sloshing back and forth so to speak. if you are talking about "particles" being photons, photons have particle type characteristics and are discrete packets of energy not physical particles.
 
Then why did the earlier scientists made up the ether theory?
 
If you are referring to quantum theory then yes light is photons, but these are discrete energy packets and not a particle like a proton.
 
adjacent said:
Then why did the earlier scientists made up the ether theory?

Because back then, for something to be a wave, there has to be a "medium" for the wave to propagate. There are many things we thought that were correct back then that we know better now.

Your original question requires a bit more explanation on what you already know and can comprehend. For example, if we give you a link to the derivation of the electromagnetic EM wave using Maxwell Equation, are you able to understand that? If you can, then you'll see that the "wave" really is an oscillation of the electric and magnetic field vectors. See this, for example:

http://hyperphysics.phy-astr.gsu.edu/hbase/waves/emwavecon.html

Since you are interested in the "wave theory" of light, we will keep it at that without invoking the photon picture.

Zz.
 
I really don't know anything about maxwell's electromsgnetic theory
 
Then just look at the picture in that link.

Zz.
 
Thanks
 

Similar threads

Replies
10
Views
3K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 4 ·
Replies
4
Views
10K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 9 ·
Replies
9
Views
4K
  • · Replies 18 ·
Replies
18
Views
4K
  • · Replies 18 ·
Replies
18
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 3 ·
Replies
3
Views
4K