Wave: Probabilistic wave or physical wave?

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Discussion Overview

The discussion revolves around the nature of waves in the context of light, specifically whether it refers to a probabilistic interpretation in quantum mechanics or a classical physical wave. Participants explore both theoretical and conceptual aspects of wave behavior in light.

Discussion Character

  • Debate/contested, Conceptual clarification, Exploratory

Main Points Raised

  • One participant questions whether the wave nature of light refers to a probabilistic location of a particle as described in quantum terminology or to a physical wave similar to vibrating a string.
  • Another participant asserts that there is no physical wave and that the concept of a medium for transmission, such as ether, is outdated and incorrect.
  • A different viewpoint emphasizes that the wave nature of light is classical, identifying it as an electromagnetic wave characterized by oscillating electric and magnetic fields.
  • One participant clarifies that the wave function in quantum mechanics does not represent a physical wave, as it exists in phase space rather than physical space, and discusses the dimensionality of wave functions for multiple particles.
  • It is noted that while classical light behaves as a wave, it does not involve a physical medium like a vibrating string, but rather consists of electric and magnetic fields that follow similar equations.

Areas of Agreement / Disagreement

Participants express differing views on the nature of waves in light, with no consensus reached on whether it is a probabilistic concept or a classical physical wave. The discussion remains unresolved regarding the interpretation of wave behavior.

Contextual Notes

Participants highlight the lack of a physical medium for light waves and the distinction between classical and quantum interpretations, but do not resolve the implications of these differences.

neurocomp2003
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Hi,
I keep debating an argument with a buddy of mine.
And I've come to the conclusion that I'm not sure what WAVE natur of light refers to.

[]Does it refer to the Quantum Terminology(found in griffiths for shro. eq'n) which is WAVE = Probabilitic Location of Particle.

OR
[]Does it refer to a physicsal existence of a wave like vibrating a string
 
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There is no physical wave - there is no medium for transmission (19th century physics postulated ether for this purpose - it doesn't exist). QED (book) by Richard Feynman gives as good a description of what's going on as any.
 
The wave nature of light is classical. It refers to the fact that light is an electromagnetic wave, i.e. an oscillating electric field and magnetic field. See http://scienceworld.wolfram.com/physics/ElectromagneticWave.html and notice how the first two equations represent progressive waves. This java applet shows this wonderfully: http://www.phy.ntnu.edu.tw/java/emWave/emWave.html
 
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The so called "wave-function" in quantum mechanics is not a physical wave, because it exists in phase space rather than physical space. For instance, for two particles, the wave function exists in a 6-dimensional space.

Classically, light is a wave because the electric and magnetic fields of which it is composed both obey the wave equation.

So the second answer is perhaps the closest to being correct, except that it should be understood that there is no physical "string" vibrating to transmit a light wave, instead there is simply a set of electric and magnetic fields that obey the same equations that a vibrating string obeys.
 

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