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Einstein says they don't have either type of mass. Richard Feynman made statements about relativistic mass, but Einstein said that's not a meaningful concept, and it's better to just refer to the momentum term in the correct equation if you're talking about momentum.
originally posted by: chr0naut
Photons do have relativistic mass, expressed as momentum. They have zero rest mass.
Repeating that doesn't make it true, the mass according to the standard model is indeed zero so if a small photon mass is ever determined it will falsify the standard model, which will be kind of a big deal.
originally posted by: Flyingclaydisk
And yes, a photon does have mass; it is not significant for most calculations, but it is not without mass...as in absolute zero.
Not small, it's indeed zero according to the standard model. Now if you're arguing the standard model is wrong, you've got a huge uphill battle to prove that because it's supported by many observations.
Photons are massless, uncharged, and have an unlimited range.
What time index does it say that? (Hint: it doesn't say that because that photons have gravitational attraction in spite of being massless was the whole point of the video, at least the part about gravity). The video specifically says photons have no mass at 30 seconds and he even writes down m=0 next to the light bulb, which means photon mass is zero. And at no point after that does he say photons have mass so I don't know how you can miss the major point of the video by so much.
originally posted by: Arbitrageur
Einstein says they don't have either type of mass. Richard Feynman made statements about relativistic mass, but Einstein said that's not a meaningful concept, and it's better to just refer to the momentum term in the correct equation if you're talking about momentum.
originally posted by: chr0naut
Photons do have relativistic mass, expressed as momentum. They have zero rest mass.
The problem was Feynman using E=mc² which is not the correct equation. I made a thread about this and provided Einstein's quote about using the correct equation instead here:
Science Quiz #2: Is E=mc² right or wrong?
Of course it's the wrong equation and it would have been better for Feynman to use the correct equation suggested by Einstein.
Mass in special relativity
Repeating that doesn't make it true, the mass according to the standard model is indeed zero so if a small photon mass is ever determined it will falsify the standard model, which will be kind of a big deal.
originally posted by: Flyingclaydisk
And yes, a photon does have mass; it is not significant for most calculations, but it is not without mass...as in absolute zero.
The Physics Hypertextbook
Not small, it's indeed zero according to the standard model. Now if you're arguing the standard model is wrong, you've got a huge uphill battle to prove that because it's supported by many observations.
Photons are massless, uncharged, and have an unlimited range.
a reply to: Phage
Time is very important. Without time everything would happen at once.
originally posted by: surfer_soul
a reply to: DeadCat
Or to put it another way, space/time and mass both have an equal and opposite effect on each other.
Relatively speaking that is?
originally posted by: DeadCat
a reply to: surfer_soul
Could say that yes, but when you equate the "mass" of light, you will likly find that the gravitational affects of photonic mass are miniscule and irrelevant compared to that of the sun.
That is to say light doesn't curve space time significantly enough to precieve, only calculate.
originally posted by: DeadCat
a reply to: surfer_soul
I don't think they literally move in waves.. the wave like behavior is in my opinion due to the infinite possibilities, until you measure it at a place and time from a relative perspective.
.
No. The speed of light is not relative. Something which makes electromagnetic radiation quite unique.
That's it, everything is relative to everything else, depending from what position you observe it, you will find different results due to space/time