Can maxwell's EM theory explain the photoelectric effect?

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Discussion Overview

The discussion centers on whether Maxwell's electromagnetic (EM) theory can adequately explain the photoelectric effect, a phenomenon famously described by Einstein in terms of particles. Participants explore the implications of classical EM theory in relation to the photoelectric effect and its historical context.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants note that while Einstein's particle explanation is well-known, classical EM theory predates this and raises questions about its ability to describe the photoelectric effect.
  • One participant suggests that classical EM can predict electron emission when light shines on metal, but questions whether it can account for the specific properties that led to Einstein's particle model.
  • Another participant argues that classical EM fails to reproduce all observed properties of the photoelectric effect, indicating limitations in its explanatory power.
  • One viewpoint emphasizes that the interaction described by Maxwell's theory is continuous, contrasting it with the impulsive interaction proposed by Einstein, suggesting a fundamental difference in how these theories conceptualize field-particle interactions.

Areas of Agreement / Disagreement

Participants express differing opinions on the adequacy of Maxwell's EM theory to explain the photoelectric effect, with no consensus reached on whether it can fully account for the phenomenon.

Contextual Notes

Participants highlight the historical context of the photoelectric effect and the evolution of theories, indicating that classical EM may not encompass all aspects of the phenomenon as observed today.

needguidance
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i know that einstein explained it in terms of particles but can maxwells EM waves explain the photoelectric effect aswell?
 
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needguidance said:
i know that einstein explained it in terms of particles but can maxwells EM waves explain the photoelectric effect aswell?

This is a bit strange, because since the classical E&M theory was in existence long before the Einstein's photoelectric effect model, one would think that if the classical E&M theory at that time can already describe the photoelectric effect, the phenomenon won't be THAT big of a "puzzle" at that time, will it?

Have you read anything about the http://galileo.phys.virginia.edu/classes/252/photoelectric_effect.html" ?

Zz.
 
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needguidance said:
i know that einstein explained it in terms of particles but can maxwells EM waves explain the photoelectric effect aswell?

That depends what you mean by "the photoelectric effect." If you're simply asking whether classical EM predicts that shining light on a metal will cause it to emit electrons, the answer is yes. If you're asking whether classical EM can reproduce the particular properties of photoelectric emission that led Einstein to think about it in terms of particles of light, the answer is maybe, depending on what kind of quantum mechanical model you introduce for the metal. But, if you're asking whether classical EM can reproduce all properties of the photoelectric effect that have been observed through the present, the answer is no.
 
needguidance said:
i know that einstein explained it in terms of particles but can maxwells EM waves explain the photoelectric effect aswell?

In my opinion, no. The mechanism whereby the Maxwellian fields (which are continuous in space and time) interact with electric charge is via the Lorentz force law. In brief, the Maxwell/Lorentz force on charged particles occurs continuously in space and time. In Einstein's explanation of the photoelectric effect, the interaction between the field and a charged particle occurs impulsively, essentially at a given point in space/time. Of course the lame answer is that if the photoelectric effect did not introduce a new paradigm for field/particle interactions, then why did Einstein get the Nobel prize?
 

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