Physics Help Forum What is the frequency of a single photon?

 Theoretical Physics Theoretical Physics Help Forum

Feb 13th 2015, 08:12 AM   #21
Physics Team

Join Date: Apr 2009
Location: Boston's North Shore
Posts: 1,573
 Originally Posted by harve What frequency means for a single photon?
The frequency f of a single photon is related to the kinetic energy of the photon by E = hf where h is Planck's constant. When a photon passes through a barrier with a double slit in it which are close together then the photon is diffracted just like a wave. The only way to measure the diffraction is if there are a large number of photons passing through during a long period of time (if the photons are passing through one by one). When that happens the diffraction patter is related to the probability density which is related to the wavelength which is related to the frequency.

It takes a lot more to explain this clearly and in detail. That's just the short take.

 Feb 22nd 2015, 07:14 AM #22 Senior Member   Join Date: May 2014 Location: Poole, UK Posts: 132 Re what we were talking about a while back, see pmb's article http://home.comcast.net/~peter.m.bro..._red_shift.htm and note the last line: "...which is simply the expression for the conservation of energy. Since this holds for any r it follows that E = constant along the photon's trajectory. I.e. The total energy of a photon moving through a gravitational field is constant. " Also note that I talked to rationalwiki referring to Einstein etc, and I'm no longer on the list of internet kooks. Last edited by Farsight; Feb 22nd 2015 at 07:16 AM.
Mar 2nd 2015, 06:47 AM   #23
Junior Member

Join Date: Oct 2014
Posts: 13
 Originally Posted by Farsight Also note that I talked to rationalwiki referring to Einstein etc, and I'm no longer on the list of internet kooks.
After you threatened to sue them, they altered their otherwise helpful page, not because of any scientific prowess. You, and I suppose your ally here, seem to want to promote your own agenda, not physics help. It is sad to see another physics board go to the cranks.

 Tags frequency, photon, single

 Thread Tools Display Modes Linear Mode

 Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post backtophysics Quantum Physics 0 May 9th 2012 08:22 AM Austic Advanced Electricity and Magnetism 2 Mar 17th 2011 03:39 PM labview1958 Light and Optics 4 Sep 24th 2010 08:23 AM Lil_Aziz1 Light and Optics 3 Sep 4th 2010 12:51 AM yzc717 Waves and Sound 0 Feb 18th 2009 01:45 AM