Why does slit diffraction occur?

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Discussion Overview

The discussion centers on the phenomenon of slit diffraction, exploring its mechanisms and how it relates to other types of diffraction, particularly Bragg diffraction. Participants also touch upon the principles underlying wave behavior and interference.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants question whether slit diffraction is similar to Bragg diffraction, suggesting it may involve scattering of photons by atoms in a material.
  • Others clarify that slit diffraction is independent of the material properties, asserting it arises from Huygens principle, where each point in a wave acts as a source for new waves.
  • A participant acknowledges a connection to x-ray scattering by electron clouds, indicating a potential misunderstanding of the principles involved.
  • A side question is raised regarding the permanence of amplitude changes in interfering electromagnetic waves, leading to a claim that the waves behave as if they had never interacted once separated.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between slit diffraction and Bragg diffraction, indicating a lack of consensus on this aspect. The side question about wave interference also highlights differing interpretations of wave behavior post-interaction.

Contextual Notes

Some assumptions about the nature of materials and wave interactions remain unaddressed, and the discussion does not resolve the complexities of wave behavior in interference scenarios.

Who May Find This Useful

Individuals interested in wave phenomena, diffraction, and the principles of wave mechanics may find this discussion relevant.

CrimpJiggler
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Is it the same thing as Bragg diffraction, in the sense that it is caused by the photons being scattered in different directions when it hits the atoms of the solid material around the slit?
 
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No, slit diffraction is independent of the properties of the material on which the slits are built (As long as the material blocks the radiation from passing right through it.). Slit diffraction happens as a consequence of scattering due to Huygens principle which states that any point in a wave can be taken as a point source for new waves.
 
Ah yeah I was thinking of x-rays which are scattered by electron clouds. Huygens principle, thanks.
 
A side question: When two electromagnetic waves interfere, is the change in amplitude permanent, meaning will they still have altered amplitudes even when they are no longer near each other?
 
No, after the two waves "separate", they continue as if they had never encountered each other.
 

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