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

Speed of light

  1. Sep 11, 2004 #1


    User Avatar

    the speed of light is 186000 mps or some such compared to what? :)
  2. jcsd
  3. Sep 11, 2004 #2
    Rephrase please. I'm not sure what you are asking.

    Paden Roder
  4. Sep 11, 2004 #3


    User Avatar
    Science Advisor
    Gold Member

    The speed of light is approximately 186,000 miles per secpnmd or exactly 299 792 458 metres per second. I don't know what you mean by 'compared to 'what', the speed of light is the same in all inertial frames.
  5. Sep 11, 2004 #4
    Oops, sorry, didn't see your post there jcsd.

    Paden Roder
  6. Sep 11, 2004 #5


    User Avatar

    So whatever inertial frame one is measuring by, light travels at c as if the inertial frame was still?
  7. Sep 11, 2004 #6


    User Avatar

    Staff: Mentor

    Yes. And that is the 2nd postulate of Special Relativity.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook