Measuring Wave Speed: Reference Frame Considerations

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Discussion Overview

The discussion revolves around the measurement of wave speed in different reference frames, specifically within the contexts of classical physics and relativity. Participants explore how the reference frame affects the interpretation of the wave speed represented in the wave equation.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions the reference frame from which the wave speed v in the wave equation is measured.
  • Another participant seeks clarification on whether the context is classical physics, relativity, or quantum mechanics.
  • A participant asserts that in classical physics, the speed of a wave on a string is measured from the lab frame, but questions the basis for this measurement.
  • There is a challenge regarding the inability to choose a reference frame for electromagnetic waves, prompting further inquiry into the implications of this limitation.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the reference frame for measuring wave speed, and multiple competing views remain regarding its implications in different physical contexts.

Contextual Notes

Participants express uncertainty about the criteria for selecting a reference frame and the implications for different types of waves, indicating potential limitations in their understanding of the wave equation's application across contexts.

Pushoam
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In the wave equation## \frac {\partial^2 \psi} {\partial x^2}=\frac{1}{v^2}\frac{\partial^2 \psi}{\partial t^2}\tag{1}##, v is the speed of the wave propagation.
With respect to which reference frame is this speed measured( in general)?
 
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What is the context of your question, classical physics, relativity or quantum mechanics?
 
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classical physics and relativity
 
What do you think v represents for each one then?
 
jedishrfu said:
What do you think v represents for each one then?
v represents speed of the wave propagation.
For example, if we take wave on a string, then the speed is measured from the lab frame.
But how do we know that the speed should be measured from the lab frame( just by knowing the wave equation)?
And why can't we decide the reference frame in case of electromagnetic waves?
 

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