JulianM Posted January 1, 2018 Report Share Posted January 1, 2018 Given that E = m.c^2and that E = h.f why can't we form a relationship for particles of light? Quote Link to comment Share on other sites More sharing options...
Shustaire Posted January 1, 2018 Report Share Posted January 1, 2018 (edited) Your not using the correct first equation. That equation is the invariant or rest mass of a particle. Photons has no rest mass You need the energy/momentum equation https://en.m.wikipedia.org/wiki/Energy–momentum_relation Edited January 1, 2018 by Shustaire Quote Link to comment Share on other sites More sharing options...
Super Polymath Posted January 1, 2018 Report Share Posted January 1, 2018 Your not using the correct first equation. That equation is the invariant or rest mass of a particle. Photons has no rest mass You need the energy/momentum equation https://en.m.wikipedia.org/wiki/Energy–momentum_relationThey do according to my theory. Quote Link to comment Share on other sites More sharing options...
JulianM Posted January 1, 2018 Author Report Share Posted January 1, 2018 Super Polymath - what is your theory? Quote Link to comment Share on other sites More sharing options...
exchemist Posted January 1, 2018 Report Share Posted January 1, 2018 (edited) Given that E = m.c^2and that E = h.f why can't we form a relationship for particles of light?Shustaire is quite right of course. The energy momentum equation is the more general form, of which the famous E=mc² is a simplified special case. The more general form is able to account for entities such as photons that have zero rest mass but which nonetheless have energy and momentum. In fact the connection between it and E=hf is made via de Broglie's relation: For a photon, the energy momentum relation reduces to E=pc. But de Broglie's relation tells us p=h/λ, so since c=fλ, we can rewrite that as p=hf/c. So we have E= (hf/c).c, i.e. E=hf. Bingo! And a rather nice connection between the two great discoveries in early c.20th physics: relativity and quantum theory. :) Edited January 1, 2018 by exchemist Quote Link to comment Share on other sites More sharing options...
Super Polymath Posted January 2, 2018 Report Share Posted January 2, 2018 Super Polymath - what is your theory?http://www.scienceforums.com/topic/30701-can-someone-model-this-mathematically No equation yet. Quote Link to comment Share on other sites More sharing options...
Shustaire Posted January 2, 2018 Report Share Posted January 2, 2018 Then a hypothesis. A theory requires equations for testability and predictions. Quote Link to comment Share on other sites More sharing options...
Vmedvil Posted January 2, 2018 Report Share Posted January 2, 2018 Ya the , p2c2 part is just a different algebra solve of this. Quote Link to comment Share on other sites More sharing options...
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