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Very quick simple question

  1. May 20, 2010 #1
    at what sort of speed ratio (v/c) would one consider relativistic effects to become important? i would probably say when v/c ~ 0.4 as this would make the gamma factor to be ~ 1.1, making a 10% difference (for length contraction, time dilation etc..). is there any "offical" value for where one should begin to consider the effects?

  2. jcsd
  3. May 20, 2010 #2


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    Depends on how accurately you need to measure, GPS satelites have to correct for relativity but the effect is tiny.
  4. May 20, 2010 #3
    ok well lets say i was to measure the velocity of a small mass particle and one with a larger mass in the lab frame (lets say an electron and proton). if both particle were to have the same wavelength and so same energy would i be correct in saying that due to their sizes it would be appropriote to include relativistic effects on the electron, but not nessasary for the proton within a good accuracy?
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