Questions with the keyword 'photon'

• Is it possible for two photons to overlap and join their energy to structure a one photon of higher frequency? by waveicle to Adam, SheilaCategory: Space Comments: (So far, one comment )
• When light goes through glass, why are photons re-emitted (from the electrons in the substance) in the same direction by doppler to Adam, Geoff, Rob, Sheila, SuzieCategory: General Comments: (so far, 4s comments )
• If photons have no mass, how can they have momentum? by freddie to AdamCategory: General Comments: (so far, 2s comments )