Does light have a mass?

Discussion in 'Physics & Math' started by GRO$$, Apr 6, 2002.

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  1. thed IT Gopher Registered Senior Member

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    What do you think

    A few hundred at least.
     
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  3. c'est moi all is energy and entropy Registered Senior Member

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    there's one missing

    13. What to do when you feel you are right, but somehow, you just can't make this hard. Well, you just start posting sarcastic jokes, the twelve rules for this or that, written by people who obviously have no live (if one of these people is reading this: get a live will ya

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    ) The only thing your posts have to do, is make feel the other party that they just won't get it, that you just can't keep waisting your time with the crancks, that you've been putting up with them too long now ... You see? You attack them with their own weapon: nonsense

    Thed, if you feel you're waisting your time, then just stop waisting it, no? That's my opinion.
     
    Last edited: Apr 16, 2002
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  5. thed IT Gopher Registered Senior Member

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    You said it best
     
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  7. (Q) Encephaloid Martini Valued Senior Member

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    Cest moi/Joeblow

    Now see what you've done, Thed's blown a fuse. We may never get him back now.

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    Thed...THED...COME BACK !!!

    Don't go towards the light !!
     
  8. thed IT Gopher Registered Senior Member

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    C'est Moi

    Intresting you think John Baez's crackpot index was directed at you. Why is that?
     
  9. c'est moi all is energy and entropy Registered Senior Member

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    Yes indeed, you said it (Q)!! Don't do it Thed, do you know what temperatures these lightbulbs can attain?

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    "You said it best"

    jeesh, I'm gonna look like Homer now: by the way, I was being sarcastic
     
  10. thed IT Gopher Registered Senior Member

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    Lol.

    God, I posted that!
     
  11. c'est moi all is energy and entropy Registered Senior Member

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    "C'est Moi, Intresting you think John Baez's crackpot index was directed at you. Why is that?"

    sorry to disappoint you little Thed but when you posted that one I was busy typing the 13nd rule (which I hope is clear enough)
    why is it that Thed can't do better than suddenly post "humor"? feeling uncomfortable? why?

    don't wanna discuss nothing? simply don't post then
    it's not worth it
     
  12. James R Just this guy, you know? Staff Member

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    Tom,

    <i>Particles in a particle accelerator are NOT accelerated by electromagnetic photons, they are accelerated by electric and magnetic fields.</i>

    And what, pray tell, do you think that electric and magnetic fields consist of?

    Hint: It starts with P.
     
  13. Adam §Þ@ç€ MØnk€¥ Registered Senior Member

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    Magnetic fields are measured/described in photons?
     
  14. c'est moi all is energy and entropy Registered Senior Member

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    James R, you know all this stuff, but I read an email discussion one time from someone who was not in agreement with the photons-who-have-to-catch-up-the-electrons model, because the particles where accelerated with electrostatic forces he said - ie, repulsion and attraction (and he was yapping some more that he himself was involved in experiments blablabla)

    I know photons, ie EM radiation, *produces* electromagnetic fields, but what about the fields themselves? I learnd that they are imagined lines where the force of attraction-repulsion is

    how is the photon involved in this field?
     
  15. James R Just this guy, you know? Staff Member

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    The concept of a "field" is a useful picture, but it is really just a shorthand way of talking about forces on charges and so on. According to quantum electrodynamics, whenever an electric or magnetic field affects a particle, that particle absorbs and/or emits photons. Photons are said to be the carrier particles of the electromagnetic interaction.
     
  16. c'est moi all is energy and entropy Registered Senior Member

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    wow! I didn't know that

    well, I had another thought because of this

    photons are EM radiation
    they are emitted by matter
    doesn't that mean that matter is EM in nature??
    some kind of standing EM waves?
     
  17. James R Just this guy, you know? Staff Member

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    Some matter has an EM nature. It's called <b>electrical charge</b>. Electromagnetic radiation is produced by the movement of charged particles.
     
  18. c'est moi all is energy and entropy Registered Senior Member

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    "Some matter has an EM nature. It's called electrical charge."

    which matter isn't? and of what kind of nature is that other matter?

    "Electromagnetic radiation is produced by the movement of charged particles."

    I also wonder, since I learnd this photon thing about EM-fields, how do they see a charge? I mean we know it is a property of matter ... but what else more? Result of some kind of interaction between virtual particles and particles?
    Also, since movement of charged particles creates EM radiation and that radiation consists of photons and these photons produce EM-fields which are really absorption-emission of photons --> abs.-emission between the photons themselves??

    last one

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    , just very simple: two magnets with south and north side, they attract each other because of the magentic field:
    how can you explain it (simple) with the photon model, what happens? why do they attract one another ... I find this strange
    in de force field model you don't think about this, you just accept the force
     
  19. thed IT Gopher Registered Senior Member

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    Neutrons and neutrinos. You could also argue that atoms as a whole are generally electrically neutral.

    As photons are the particle analog of EM fields a photon can interfere with a EM wave. The interelation of things is quite complex.

    I would not go as far as to say EM is a property of matter. EM is a form of energy and can be emitted by energetic particles.

    The hardest aspect of quantum theory to grasp is that things are both waves and particles, at the same time. EM is not comprosed of photons, it is photons. Which we detect depends on the method of detection. You use the relevant model also.

    And that is the great conceptual leap you need to understand quantum electrodynamics. Forces are mediated by the transfer of momentum between particles. On the macro scale you see a force. On the microscopic scale of particles the 'field' is the transfer of momentum between particles.

    This leads to the wild concepts of quantum gauge theories where instead of a field having force and direction at given points the field is a set of quantum properties. No, I don't really understand it either.
     
  20. Thed,

    "And that is the great conceptual leap you need to understand quantum electrodynamics. Forces are mediated by the transfer of momentum between particles. On the macro scale you see a force. On the microscopic scale of particles the 'field' is the transfer of momentum between particles. "

    Just like gravity, right???


    Tom
     
  21. Crisp Gone 4ever Registered Senior Member

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    Hi Tom,

    That is exactly what physicists are trying to find out by creating a good quantum theory of gravity. The mainstream idea however is indeed that gravity is also mediated by particles (gravitons) that form the gravitational field.

    Bye!

    Crisp
     
  22. Stryder Keeper of "good" ideas. Valued Senior Member

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    I'm not going to root through the postings too much.... Well it's tedious and my back button might trigger loads of unwanted scripts

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    Seriously, I was wondering if you'd had the primliminary arguement of "can a particle be called a particle if it acts like a wave?" Or my person thought "Can a bunch of waves act like a particle?".

    I've mentioned my thought on atomics many times.

    I use to try and explain what my thoughts were to Reign_of_Error on another board, but back then my perception was using what rudimentary models had been sculptured from Modern Physics. (Notably, Rutherfords model)

    I was then one day looking through some information about how long an electron lasts when it's un-attached from its atom, it lasted a few seconds and then its energy would disperse. I also found something on Neutron bombardment, it mentioned that neutrons could be bombarded at other matter and they had a shorter life span than electrons (my memory can play tricks so if thats wrong please correct)

    This meant while each of these was a piece to an atom, they couldn't exist for long on their own. This gave me a suspiscion that the only reason they exist is due to energy keeping them "alive" while they are in the specific places. Namely an electron charges the neutron to hold it's form and in return it charges itself to hold its own form.

    My understanding was that the charge was created from electromagnetics (Schrodingers Psi wave), which are created from energy exersions accumilating throughout an electrons orbit. (not to forget to mention the other movements that other portions of an atom have too, since they are never "frozen".)

    This also gave me a clue that everything is comprised of highscale (high spectrum) photon charges. (This is where someone will probably state whata load of...) These photon charges can be noted through either "knowing of the sun" (don't look directly at it) or from atomic reactions. (Afterall an atomic reaction causes an extreme release of radation and energy, which is itself Photonic).

    This pretty much has me terming that all atoms are "holograms" from the shear fact that they are a photonic matrix's.
     
  23. James R Just this guy, you know? Staff Member

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    c'est moi:

    There are lots of neutral particles around, such as photons, gluons, Z bosons, and composite particles like neutrons, neutral pions, Kaons etc.

    <i>I also wonder, since I learnd this photon thing about EM-fields, how do they see a charge?</i>

    How do what see a charge?

    <i>two magnets with south and north side, they attract each other because of the magentic field: how can you explain it (simple) with the photon model, what happens?</i>

    Atoms in one magnet emit virtual photons which travel to the other magnet, carrying the magnetic force. The important thing to realise is that virtual particle interacts can result in attractive forces as well as repulsive ones.
     
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