Quote:
Originally Posted by Archy
I asked how can the "redshift" of a single photon be measured
Renormalised replied "...Very easily, with a photomultiplier tube and in exactly the same way as you measure a redshifted spectrum. You look at (or determine via theory) what the original wavelength/frequency of the photon was when it left the source and compare that with what you measured at the photomultiplier."
Bojan replied inter alia
Bojan's reply that the redshift cannot be measured contradicts Renormalised. I agree with Bojan the redshift of a single photon can't be determined. Others in the thread were unwilling or unable to answer the question. When I pressed for an answer gave wrong, irrelevant or evasive replies and cast aspersions on my motives. Gentlemen, whether you answer questions or not is your prerogative: but what you have indulged in just wastes space.
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What was the relevance of your question regarding cosmological redshift and relativity?