1. Just wanna clarify some equations.

Transverse Doppler Effect

In the formula provided, what does θ represent?

2.

3. Originally Posted by Naggy Doggy
Just wanna clarify some equations.

Transverse Doppler Effect

In the formula provided, what does θ represent?
It is the angle between the relative velocity vector, and an imaginary line connecting the source and the observer of the wave signal. Refer also here :

Relativistic Doppler effect - Wikipedia, the free encyclopedia

4. Originally Posted by Markus Hanke
Originally Posted by Naggy Doggy
Just wanna clarify some equations.

Transverse Doppler Effect

In the formula provided, what does θ represent?
It is the angle between the relative velocity vector, and an imaginary line connecting the source and the observer of the wave signal. Refer also here :

Relativistic Doppler effect - Wikipedia, the free encyclopedia
So relative velocity vector refers to the relative velocity between the light source and the light detector?

5. Originally Posted by Naggy Doggy
So relative velocity vector refers to the relative velocity between the light source and the light detector?
Yes, between emitter and observer of the light.

6. ok thanks

7. Originally Posted by Markus Hanke
Originally Posted by Naggy Doggy
Just wanna clarify some equations.

Transverse Doppler Effect

In the formula provided, what does θ represent?
It is the angle between the relative velocity vector, and an imaginary line connecting the source and the observer of the wave signal. Refer also here :

Relativistic Doppler effect - Wikipedia, the free encyclopedia
Hmm, this doesn't seem to be quite right, the definition is slightly different:

"In the frame of the receiver, represents the angle between the direction of the emitter at emission (in other words, the relative velocity vector), and the observed direction of the light at reception (in other words, the wave vector of the light signal)."
In the case of the TDE,

8. Originally Posted by xyzt

Hmm, this doesn't seem to be quite right, the definition is slightly different:

"In the frame of the receiver, represents the angle between the direction of the emitter at emission (in other words, the relative velocity vector), and the observed direction of the light at reception (in other words, the wave vector of the light signal)."
In the case of the TDE,
Maybe I am blind, but I fail to see the difference...?

9. Originally Posted by Markus Hanke
Originally Posted by xyzt

Hmm, this doesn't seem to be quite right, the definition is slightly different:

"In the frame of the receiver, represents the angle between the direction of the emitter at emission (in other words, the relative velocity vector), and the observed direction of the light at reception (in other words, the wave vector of the light signal)."
In the case of the TDE,
Maybe I am blind, but I fail to see the difference...?
Not the " imaginary line connecting the source and the observer" but the wave vector.
It is the angle made by 2 vectors.

10. Originally Posted by xyzt
Not the " imaginary line connecting the source and the observer" but the wave vector.
It is the angle made by 2 vectors.
Ok, I take your point, but then again, my "imaginary line" ( yeah, the expression is admittedly a bit silly ) would coincide with the direction of the wave vector...

11. Originally Posted by Markus Hanke
Originally Posted by xyzt
Not the " imaginary line connecting the source and the observer" but the wave vector.
It is the angle made by 2 vectors.
Ok, I take your point, but then again, my "imaginary line" ( yeah, the expression is admittedly a bit silly ) would coincide with the direction of the wave vector...
Not really, the "imaginary line connecting the observer and the source" does not necessarily coincide with the wave vector.

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