Light has mass according to e=mc^2 light has mass.
E=mc^2
HV=mc^2
HV/c^2=m
H/c x wavelength=m
By this formula we can see that mass of light is dependent on wavelength.so it cannot be constant.As wavelength of light lies between 400-700nm I calculated the maximum and minimum mass of light.
Maximum mass of light =0.553x10^-32g
Minimum mass of light =0.31×10^-32g
Generally we think light is massless because photons are massless.But photons rest mass is zero and photons have mass when they are in motion.
If anything is wrong please comment

Positive: 63.636363636364 %

Answer #2 | 22/05 2017 04:04

No, not definite. But it might have. If it does its upper limit is roughly m < 1E-16 eV/c^2, which makes it a billion billion times less massive than the neutrino m < 2 eV/c^2 that was the least massive of all particle until, maybe, now.

Answer #1| 22/05 2017 04:0463.636363636364 %