Doppler shift source velocity components

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Discussion Overview

The discussion revolves around the Doppler effect, specifically addressing how it operates when the observer and source are not moving in a straight line. Participants explore the implications of velocity components in the Doppler effect equation.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions how to determine the velocities of the observer and source when their motion is not linear.
  • Another participant suggests that there is a single plausible answer based on the physics involved.
  • A third participant proposes that only the velocity component parallel to the wave's propagation direction should be considered.
  • A later reply confirms this by emphasizing the importance of accounting for the wave's travel direction and the position of the receiver at the time of pulse reception, noting potential complications if the receiver is accelerating.

Areas of Agreement / Disagreement

Participants express differing views on the interpretation of the Doppler effect in non-linear motion, with some proposing specific approaches while others suggest a more general understanding. The discussion remains unresolved regarding the best method to apply in such scenarios.

Contextual Notes

There are limitations in the assumptions made about the motion of the observer and source, particularly regarding acceleration and the timing of wave reception.

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how does the doppler effect work when the observer and source are not moving in a straight line, what do we take in as the velocity of the observer and the source in the doppler effect equation?

source-and-observer-towards-each-other-png.187422.png
 
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What do you think?

Given the physics of what's going on there's only one plausible answer as far as I can see.
 
is it the velocity component that is parallel to the direction of the propagation of the wave?
 
Correct. You need to take care about what direction the wave is traveling because where the receiver is when it receives a pulse is not where it was when it was emitted (which can get messy if the receiver is accelerating). As long as you remember about leading a moving target when you set up your maths, you're fine.
 

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