Speed of light for different observers

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The discussion centers on the implications of Special Relativity regarding the speed of light as perceived by different observers. It critiques the traditional understanding that light requires a medium, suggesting instead that space itself acts as a medium for light waves. A thought experiment is proposed involving a moving train-car with light emitted from it, illustrating how two observers can perceive the same light emission at different frequencies due to their relative motion. The conversation also touches on the Doppler effect and challenges the consistency of Special Relativity by questioning whether different frequencies imply different speeds of light. Ultimately, the participants aim to deepen their understanding of how light behaves in relation to various frames of reference.
  • #61
sisoev said:
This "home work" just shows how deceived people are about wave length and wave frequency.
600 nm in the "home work" is the wave length and it never changes.
:rolleyes:
The frequency is measured in Hz and it depends on the speed of the light - how fast the wave length is observed, and that depends on the additional speed added to it by the moving source or moving observer.
That's not even true for the classical Doppler effect for sound when the source is moving, never mind for light! When a sound source approaches, the observed frequency increases--yet the speed of the sound doesn't change.

When we observer different frequency, we must be able to calculate the wave length (which never changes), but that is impossible without knowing the velocity and add it to the speed of the light.
I already pointed to this in my previous comment but you chose not to comment on it.
You're wrong, as I've said repeatedly.

I still have my last comment coming.
Please read the sticky at the top of this forum--the one titled "IMPORTANT! Read before posting". In part, it says:
This forum is meant as a place to discuss the Theory of Relativity and is for the benefit of those who wish to learn about or expand their understanding of said theory. It is not meant as a soapbox for those who wish to argue Relativity's validity, or advertise their own personal theories.​
You don't seem to be interested in learning about relativity, just in discussing your own personal interpretation. You've had your time. This thread is done.
 

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