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LEDs don't give single spectral lines, but lasers (nearly) do.
some people still need convincing that E = hf,
As with Newtonian physics, relativity distinguishes between constant speed and acceleration.
The only confusion arises in the minds of people who confuse a mathematical model of a photon with an actual photon, because there are two useful m
From my travels it would seem that this is mainly controversial when E is the energy of a photon.
But none at all about the energy it carries.
Quote from: Bored chemist on 24/01/2019 20:14:12But none at all about the energy it carries.There should always be a question mark about E-hf for a photon until E can be measured directly:)
Quote from: alancalverd on 24/01/2019 09:06:34As with Newtonian physics, relativity distinguishes between constant speed and acceleration.Maybe the theory excludes acceleration because it invalidates the theory? Also, easy to point to time as the culprit when the theory doesn't work but not possible to explain away photon emission between two particles that think they are at rest even when seen to be accelerating by other particles.
Quote from: mxplxxx on 24/01/2019 20:09:40Quote from: alancalverd on 24/01/2019 09:06:34As with Newtonian physics, relativity distinguishes between constant speed and acceleration.Maybe the theory excludes acceleration because it invalidates the theory? Also, easy to point to time as the culprit when the theory doesn't work but not possible to explain away photon emission between two particles that think they are at rest even when seen to be accelerating by other particles.Relativity does indeed deal with acceleration. Particles don't think. You would be well advised to learn some basic physics before pontificating on the subject.
Quote from: alancalverd on 23/01/2019 15:29:45you can't "validate" E = hf because it is the definition of h.Actually, you can. There are other ways of measuring hhttps://en.wikipedia.org/wiki/Brownian_motion#Einstein's_theoryhttps://en.wikipedia.org/wiki/Noise_temperature
you can't "validate" E = hf because it is the definition of h.
Quote from: Bored chemist on 23/01/2019 19:46:54Quote from: alancalverd on 23/01/2019 15:29:45you can't "validate" E = hf because it is the definition of h.Actually, you can. There are other ways of measuring hhttps://en.wikipedia.org/wiki/Brownian_motion#Einstein's_theoryhttps://en.wikipedia.org/wiki/Noise_temperatureI was so intrigued by your statement that I read both articles. Neither mentions Planck's constant. The symbol h appears in the first article, but means barometric height, not action.
Quote from: chiralSPO on 23/01/2019 02:46:14That is correct. There is no good way to directly measure the energy of a single photon.Why is that?
That is correct. There is no good way to directly measure the energy of a single photon.
One last try at punching smoke. The ultraviolet catastrophe was solved by Planck introducing h. Otherwise the classical theory would still predict the energy approaching infinity at shorter wavelengths. https://en.m.wikipedia.org/wiki/Ultraviolet_catastropheIf you still don't understand then there is no hope.
the uncertainty principle states either location or velocity can be determined, approximately.