How many photons can you fit in a particular region of space at a point in time?
a photon is taken to be a point particle
As many as you want.
Photons are bose particles so the more photons there are in one point the more chances of other photons getting there.
On the other hand, you can't have more than two electrons in the same point in space because of pauli's exclusion principle. (and because the electron is spin 1/2)
Ok, thanks for your answers guys.
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