Single Photon

1. Nov 30, 2003

toe21k

Last edited by a moderator: Nov 30, 2003
2. Nov 30, 2003

mathman

C is the speed of light in a vacuum. This does not depend on the number of photons.

3. Dec 1, 2003

nocturn

phase velocity and group velocity

c is defined as group velocity of EM wave:
$$\frac{\omega}{k}$$
I think c of one photon is less meaning.
From the point fo quantum,position of one particle is uncertain.

4. Dec 1, 2003

Staff: Mentor

Re: phase velocity and group velocity

That is true, but only while in transit. The speed measured between when photon is emitted and recieved (in a vacuum) is always exactly C.

5. Dec 4, 2003

Nacho

russ_watters,

What do you mean by "vacuum", as you used it in that paragraph? I mean, the term is always used when talking about the SOL, but I don't think I have ever read a rigorus definition of "vacuum" when it is used in conjunction with the SOL.

6. Dec 4, 2003

nocturn

It is sure media will effect on particles.I think there are two different phrases in physics, classical and modern.Here,measurement the former,photon the later.QM says photon is spreading in space. One can get its state function also its probability of some classical quantities,energy,momentum,etc. and other,spin,degenerate... which have not corresponding concepts in class.But when we measure,an action of classical,photon will collapse and has a certain E,M,Position,etc. In this meaning, photon is not a photon of "quantum",only classical.

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