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Thread: light speed

  1. #61
    Join Date
    Sep 2002
    Posts
    30
    Yeeeeee-haw!
    Are you talking to yourself Agora?

  2. #62
    Join Date
    Aug 2002
    Posts
    2,189
    On 2002-11-11 14:16, AgoraBasta wrote:
    You may juggle definitions and restrictions till you get your errors look almost correct. This can't help you eradicate your basic misuderstanding of physics, like those that led you to stating that an e-e+ pair has no mass.
    Everything I said up to the point about the system of two photons was correct. I was very sloppy in my response to John K. in that I wasn't thinking about the system's mass but rather the individual photon's mass. This is akin to lazy reference-frame switching. The photons in their respective isolated reference frames still have no mass. That was my intention in my first post, but I ended up writing exactly the wrong thing. I don't think this means my physical understandings are incorrect. It is still correct that a single isolated photon, no matter how energetic, cannot on its own decay into an electron-positron pair. Virtual pair production, however, is important for other systems involving individual photons.

  3. #63
    Join Date
    Sep 2006
    Posts
    1,094
    If you travelled away from earth at the speed of light, from earths perspective you would appear to be stationary ! when travelling back at the speed of light it would appear the same. Albeit your time away from earth would be longer. This is only as an observer. As a traveller, the period of time would seem longer however the time travelling and the time observed would be the same. How can it be different ?

  4. #64
    Join Date
    Sep 2006
    Posts
    1,094
    Why ? if possible ? would travelling at c mass increase ?

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