As far as I know photons don't have mass but they do have momentum ($p=mv$). Scientists say that if we put a shiny (reflective) shield of large radius in the vacuum of space, then light from sun will will start moving the shield. How can these two facts be commensurate?
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$\begingroup$ okay got it! it doesnt have nothing to do with momentum the electric charges that forms light make it sail.. $\endgroup$– Arun MalikCommented Feb 19, 2014 at 15:46
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3$\begingroup$ It does have everything to do with momentum. Light does not have charge or mass, but it does have momentum. en.wikipedia.org/wiki/Photon#Physical_properties $\endgroup$– hpekristiansenCommented Feb 19, 2014 at 15:56
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1$\begingroup$ It comes down to them having momentum, which brings us to physics.stackexchange.com/q/2229 $\endgroup$– dmckee --- ex-moderator kittenCommented Feb 19, 2014 at 16:01
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