Gene Fuller wrote:
Cecil Moore wrote:
Hecht says: "... researchers ... have conducted experiments
in which they literally counted individual photons".

Hecht is quite correct. This is a standard technique in several areas of
physics research. I personally spent several years in my relative youth
designing, building, and using photon counting apparatus.

Feynman talks a lot about when the waves get weaker,
the clicks from the detectors get farther apart, but
the intensity of each click doesn't get any weaker.
--
73, Cecil http://www.w5dxp.com