Can maxwell's EM theory explain the photoelectric effect?

In summary, the conversation discusses the relationship between Einstein's explanation of the photoelectric effect in terms of particles and Maxwell's classical electromagnetic theory. It is debated whether Maxwell's theory can fully explain the observed properties of the photoelectric effect, and the role of quantum mechanics is also mentioned. It is also noted that Einstein's explanation introduced a new paradigm for field/particle interactions.
  • #1
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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  • #2
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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  • #3
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.
 
  • #4
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?
 

Related to Can maxwell's EM theory explain the photoelectric effect?

1. How does Maxwell's EM theory explain the photoelectric effect?

Maxwell's electromagnetic (EM) theory explains the photoelectric effect by describing how light behaves as both a wave and a particle. The theory states that light is made up of tiny packets of energy called photons, which have both wave-like and particle-like properties. When light hits a metal surface, the photons transfer their energy to the metal electrons, causing them to be emitted from the surface.

2. What is the relationship between Maxwell's EM theory and the photoelectric effect?

The photoelectric effect provides evidence for the validity of Maxwell's EM theory. The theory predicts that light can transfer energy to electrons in a metal surface, causing them to be emitted, which is exactly what is observed in the photoelectric effect. This relationship supports the idea that light has both wave-like and particle-like properties.

3. Can Maxwell's EM theory fully explain the photoelectric effect?

No, Maxwell's EM theory alone cannot fully explain the photoelectric effect. The theory can describe the mechanism by which electrons are emitted from a metal surface when exposed to light, but it does not explain all the details of the effect. For example, it cannot explain the threshold frequency or the fact that the number of ejected electrons is proportional to the intensity of the light.

4. How does the photoelectric effect challenge classical physics theories?

The photoelectric effect challenges classical physics theories because it cannot be explained using classical electromagnetic theories. According to classical theories, the energy of a wave should be proportional to its intensity, but the photoelectric effect shows that the energy of a wave is dependent on its frequency. This contradicts classical theories and led to the development of quantum mechanics.

5. Can other theories explain the photoelectric effect?

Yes, other theories such as Einstein's theory of the photoelectric effect and quantum mechanics can also explain the photoelectric effect. Einstein's theory proposed that light consists of discrete particles called photons, which can transfer their energy to electrons in a metal surface. Quantum mechanics also provides a more complete explanation of the effect by incorporating the concept of energy levels and the discrete nature of light and matter.

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