Combining SR and the Broglie Wavelength equations: Are they cumulative?

  • Context: Undergrad 
  • Thread starter Thread starter That fast guy
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    Sr Wavelength
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Discussion Overview

The discussion revolves around the relationship between the Broglie wavelength of a particle and the principles of Special Relativity, specifically whether these concepts can be combined or are cumulative in their effects. The scope includes theoretical considerations and conceptual clarifications regarding the behavior of particles at relativistic speeds.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions how to approach a problem that combines the Broglie wavelength equation with Special Relativity, specifically asking if they are cumulative.
  • Another participant seeks clarification on what is meant by "combine," indicating a need for more precise definitions.
  • A further response suggests that as a particle moves faster, its wavelength would appear shorter from a stationary reference point, raising questions about the implications of relativistic effects on wavelength.
  • Another participant argues against the idea of counting the same effect twice, stating that the relationships E = ħω and p = ħk apply to relativistic particles and that for such particles, momentum should be expressed as p = γmv.

Areas of Agreement / Disagreement

Participants express differing views on whether the Broglie wavelength and relativistic effects can be combined or if they represent overlapping concepts. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

There are limitations in the assumptions made about the definitions of "combine" and the implications of relativistic effects on the Broglie wavelength. The discussion does not resolve how these concepts interact mathematically or conceptually.

That fast guy
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I don't think this would ever come up on any of my tests in high school, but how would one answer a question combining the Broglie Wavelength of a particle and Special relativity?
Are they cumulative?

BW : λ= h/mv
 
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What do you mean by "combine"?
 


like when the wavelength shortens when the particle goes faster, would, from a stationary reference point relative to the particle's motion, because of the motion, the wavelength appear to be even shorter?
 


Sounds like you're wanting to count the same effect twice, fast guy. The relationships are E = ħω, p = ħk, and these hold even for relativistic particles and in all reference frames. If the particle is relativistic, use p = γmv, that's all.
 

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