Wave / particle duality of light

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Discussion Overview

The discussion revolves around the wave-particle duality of light, specifically addressing how light from the Sun behaves as it travels to Earth. Participants explore whether light can be considered a wave, a particle, or both, and discuss the implications of these perspectives on the nature of light's travel through space.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant describes light as behaving like a wave, using the analogy of a Mexican wave in a stadium, where the wave propagates without the individual participants traveling across the stadium.
  • Another participant suggests that photons should not be viewed strictly as classical particles or waves, emphasizing that they exhibit properties of both depending on the observation context.
  • A different viewpoint claims that wave-particle duality is not a relevant concept in modern quantum theory, implying a shift in understanding from traditional interpretations.
  • One participant argues against the notion of light as a stream of particles, stating that the quantization of electromagnetic radiation means energy changes occur in discrete amounts (photons) rather than as a continuous stream.
  • A reference to a FAQ thread is provided, suggesting that this topic has been discussed previously in the community.

Areas of Agreement / Disagreement

Participants express differing views on the interpretation of light's behavior, with no consensus reached on whether wave-particle duality is a valid framework or how light should be conceptualized in terms of its travel from the Sun to Earth.

Contextual Notes

Some assumptions about the nature of light and its behavior are not fully explored, and the discussion reflects varying interpretations of quantum theory and the implications of quantization.

cliffhanley203
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Homework Statement


I've just read that light can behave like a wave at times, and a particle at other times. How does the light from the Sun traveling towards Earth behave? A wave? A particle? Or both? And is it in any sense something that actually starts at the Sun, travels across space and ends up at the Earth; or is it more of a domino effect where something at the Sun causes a chain of effects between the Sun and Earth

Homework Equations



No relevant equations (that I'm aware of)

The Attempt at a Solution


When thinking of light as a wave I imagine a Mexican wave of people in a sports stadium where the wave propagates across the stadium by virtue of the people standing up and sitting down. In this scenario the people move up and down but their position doesn't vary (apart from moving up and down; they don't travel across the stadium).

But when thinking of it as a particle I imagine photons (discrete packets of light? quanta of light?) starting at the Sun and traveling across space in a stream so the first quantum of light (the first photon) that left the Sun is the first to arrive here and so on (?)

If anyone is kind enough to help me with this please keep the language very basic as I'm a novice. Thanks.[/B]
 
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You should not think of photons as neither classical particles nor waves. They are quantum particles and have some properties that we typically would associate with a classical particle and some that we would typically associate with a wave - but that does not mean that they are sometimes one and other times the other. Depending on what you are observing, one or the other behavior can be dominant.
 
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Wave-particle duality is not a concept used in modern quantum theory.
 
To my mind, one should never think of a light beam as stream of particles traveling across space. Quantization of electromagnetic radiation means that the field energy can only be changed by integer numbers of „energy portions“ (called photons) of amount hν, where ν is light frequency and h Planck's constant.
 

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