Understanding an electron's emission of electromagnetic waves

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Discussion Overview

The discussion revolves around the conditions under which an electron emits electromagnetic waves, specifically focusing on whether this occurs during acceleration, deceleration, or both. The scope includes theoretical considerations and conceptual clarifications related to wave emission in different inertial frames.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants question whether an electron emits light only during acceleration, only during deceleration, or during both processes, highlighting uncertainty about the conditions for emission.
  • One participant notes that acceleration can appear as deceleration in different inertial frames, suggesting that the emission of photons may not depend solely on the type of acceleration.
  • A later reply introduces the concept of cyclotron radiation, indicating that circular motion involves acceleration and can lead to light emission, thus complicating the initial question.
  • Another participant asserts that an electron does emit light when it accelerates, presenting this as a straightforward answer without further elaboration.

Areas of Agreement / Disagreement

Participants express differing views on the conditions for light emission by electrons, with no consensus reached on whether emission occurs during acceleration, deceleration, or both.

Contextual Notes

There are unresolved questions regarding the dependence of photon emission on the observer's frame of reference and the specific conditions under which acceleration leads to emission.

Marvin94
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Hi to everybody ! I was thinking about something which confuses me about wave emission.
The question is simply the following:
Does an electron emit light when it accelerate? or just during its deceleration? or maybe when acceleration and deceleration alternates in some order? I'm not really sure, so thanks a lot in advance for your help!
 
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But doesn't acceleration look like deceleration in some other inertial frame? The emission of photons can't depend on that, only the wavelength and direction of the emitted photons does.
 
Hm, ok I'm more confused. Can you change the fact that V1 > V0 remaining in the same inertial frame ?
 
Marvin94 said:
Hi to everybody ! I was thinking about something which confuses me about wave emission.
The question is simply the following:
Does an electron emit light when it accelerate? or just during its deceleration? or maybe when acceleration and deceleration alternates in some order? I'm not really sure, so thanks a lot in advance for your help!

Is a particle moving around in a circle accelerating? If yes, then look up cyclotron radiation.

I can also jiggle a bunch of electrons up and down, as if they are at the end of a spring. Is this both accelerating and decelerating? Yet, this is more than just a silly analogy, because many light sources around the world generate light when relativistic electron bunches passes through a series of wigglers or undulators that cause them to move just that and generate everything from IR to UV to x-ray to hard x-ray. FEL works on such a principle.

Zz.
 
"Does an electron emit light when it accelerate?"
The simple correct answer is YES.
 

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