Have red shifted photons lost energy and where did it go?
58042
Redshifting of Light and the expansion of the universe
108893
Why does sunlight cause colors to fade?
60149
Can photons be detected without being absorbed?
130255
Why doesn't a typical beam splitter cause a photon to decohere?
129261
Photoelectric effect absorption coefficient decreases with energy, why?
2191
Is there a maximum amount of photons that can exist in a certain amount of space?
123948
Why do I not see evidence of discrete energy in the spectrum?
8077
Photons in expanding space: how is energy conserved?
90147
Do light experience Doppler shift along and against frame dragging?
48690
Does a photon interfere only with itself?
153323
Does light change color on its way through a window?
140380
Is there a physical reason for colors to be located in a very narrow band of the EM spectrum?
23937
What is the mechanism behind the slowdown of light/photons in a transparent medium?
28971
Do Photons Move in a Wave Like Pattern?
100599
What is the trajectory of a photon moving through a vacuum?
117653
How does light travel?
42645
Does the universe expansion theory take into account that light emitted by massive stars is red-shifted?