Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Infinite energy, light speed.

  1. Nov 22, 2007 #1
    I'm kind of new to theory and, here is something I thought about, please tell me if I'm wrong.

    If it takes infinite energy to travel at speed of light, photons that travel at speed of light, must have infinite amount of energy, and if time flow is approaching 0 for the (photon), photon energy is approaching infinity, since there is no time flow for that object. It would be impossible to measure it's speed because it would "drop out" from our time dimension. And the speed that had been measured is not actual light speed , but a speed that of photon that had been slowed down by gravity of objects in universe and other forces, there for it still in our 4D.
     
  2. jcsd
  3. Nov 22, 2007 #2

    PhY

    User Avatar

    Infinite energy of What to travel at the speed of light?
    I don't know about protons ....but then again It doesn't take infinite energy for a power station to light up your average 60W light bulb.

    You also cannot have infinite energy, nobody knows what number infinite really is in any case.

    Then again, I've just started physics... and it shows.
    Interesting read :http://en.wikipedia.org/wiki/Faster-than-light
     
    Last edited: Nov 22, 2007
  4. Nov 22, 2007 #3

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    You assumption is wrong. Objects with non-zero mass cannot move at the speed of light, in part because it would require infinite energy to make them move that fast. However, photons do not have non-zero mass so that does not apply to photons.

    No, it's not impossible to measure the speed of light. I'm not clear where you get that "it would 'drop out' from our time dimension"- or even what that means.

    A photon is NOT "slowed down by gravity". Nothing can slow down a photon- it always moves at the speed of light.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?