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To: dartuser
Photons have mass.

No, they do not.

42 posted on 09/22/2011 12:55:36 PM PDT by kosciusko51
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To: kosciusko51

Theorized to have no rest mass.

http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photon_mass.html


52 posted on 09/22/2011 1:01:05 PM PDT by filospinato
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To: kosciusko51

Ok now.

Photons have a REST mass of zero.
However, photons have an effective mass - since they are never at rest - of hv/(c^2), h=planck’s constant, v=frequency, c=speed of light in vacuume.

As far for neutrinos, experiments indicate that neutrinos have a REST mass of a few eV (electron-volts). That neutrinos change from 1 form of neutrino to another is a consequence of the non-zero REST mass.


71 posted on 09/22/2011 1:14:53 PM PDT by barracuda1412
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