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Do antennas radiate photons?
On 7/13/2015 3:16 AM, George Cornelius wrote:
In article , Jeff Liebermann writes: Photon (RF or light) pressure have been measured in the laboratory by using two pressure gauges, blocking RF and light from one gauge, and measuring the differential pressure. The differential measurement cancels external influences, such as gravity, wind, earth movement, etc. Maxwell's equations - classical field theory - predict light pressure even without photons and quantum theory. Double slit experiments show interference patterns are followed even by single photons allowed to to pass - exactly as if each photon converted to a wave and portions passed through each slit and thus _the photon interfered with itself_. You really have to observe quantum effects before you can register individual photons. And, with e = h nu, nu being frequency, quantum effects at UHF and below are much harder to see because each photon has such low energy. That is the real problem with observing EM photons. IR which has a much shorter wavelength and higher frequency stimulates molecular motion, vibration and spinning which is heat. To see even microwave quanta the apparatus would have to be cooled to very low temperatures to eliminate the interference. Do Josephson junctions work at the level of EM quanta? It has been a long time since I've seen much about them. I don't even remember what they do except that they are QM phenomenon. -- Rick |
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