Question regarding de Broglie wavelength.

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Discussion Overview

The discussion revolves around the concept of de Broglie wavelength, particularly in relation to massive particles and their potential to emit light if their momentum matches that of photons in the visible spectrum. Participants explore the implications of varying momentum on the de Broglie wavelength and its relationship to electromagnetic radiation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether an object with sufficient momentum could emit light if its de Broglie wavelength matched that of visible light.
  • Another participant clarifies that the de Broglie wavelength is not the wavelength of radiation emitted by a particle, but acknowledges that a massive particle could have the same de Broglie wavelength as a photon if it had equivalent momentum.
  • A participant notes that if a mass has no momentum, its de Broglie wavelength would be infinite, prompting further inquiry into the implications of this scenario.
  • Another response suggests that an infinite wavelength would prevent the execution of a double-slit experiment with that mass.
  • One participant elaborates that a very small momentum would result in a large de Broglie wavelength, which could interact with matter through low-energy photons.
  • It is reiterated that the de Broglie wavelength does not correspond to the wavelength of electromagnetic radiation emitted or absorbed by a massive particle, emphasizing the need for a larger experimental setup to observe interference patterns with large wavelengths.
  • A participant draws an analogy between different types of electromagnetic waves, such as radio waves and microwaves, to illustrate the concept of wavelength and its effects on matter interaction.

Areas of Agreement / Disagreement

Participants express differing views on the implications of de Broglie wavelength in relation to momentum and light emission. There is no consensus on the interpretations of infinite wavelength scenarios or the relationship between de Broglie wavelength and electromagnetic radiation.

Contextual Notes

Some discussions highlight the limitations of understanding the implications of infinite wavelength and the conditions under which interference patterns can be observed, but these remain unresolved.

Polyrix
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Hi there,


Is it possible if an object were to hypothetically gain enough momentum such that its de Broglie wavelength is equivalent to, say, some light in the visible spectrum, that the object would emit light?


Thanks!
 
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The de Broglie wavelength is not the wavelength of radiation emitted by a particle. But yes, if a massive particle had the same momentum as a photon in the visible range then its de Broglie wavelength would be the same as the wavelength of a photon in the visible range.
 
If the mass had no momentum, its wavelength would be infinite, but what would that mean?
 
It would mean that you couldn't do a double-slit experiment with it.
 
vin300 said:
If the mass had no momentum, its wavelength would be infinite, but what would that mean?

itbell nailed it. But if the momentum was very small, it would mean the deBroglie wavelength was large. Radiation of an equal wavelength would interact with matter via very low energy photons.
 
No, the deBroglie wavelength is not the wavelength of EM radiation emitted by a massive particle nor is it a wavelength of EM radiation absorbed by a massive particle. A large deBroglie wavelength essentially means that you would need a large double-slit experiment in order to see interference fringes.
 
It's pretty intuitive actually, much as you can envision it a radio wave vs. a microwave. in terms of wavelength and how that effects its reception by various forms of matter.
 

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