Photon's Mass?

kirtg

doesn't the kinetic energy of a photon give it a "mass" if energy=mass and mass=energy?

kirtg

if a photon is massless like the neutrino and has not charge like the neutrino, why doesn't it penetrate matter like the neutrino?

Spourk

Neutrinos have mass.

kirtg

So if a nearly massless neutrino with no charge can penetrate matter with little likelihood of a collision, why doesn't a photon do the same thing"

Matterwave

The photon interacts with charged particles (like the electrons in atoms) via QED (EM forces basically). Neutrinos only interact with particles via the weak force.

Photons do not have rest mass.

In general, it's better to read the faq if you have some basic misunderstandings. If you can't find the answer in the faq or a quick search, then post a new thread, don't bump a ~decade old thread (holy crap PF is ~decade old!?).