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

Just when I started to get things straught in my head.

  1. Aug 27, 2009 #1

    Gives a formula for time dialation which is repeated in many other soucres. In this version t'/to increases with v. Its time dilation time is meant to slow?


    A useful set of pages for those wanting to learn. The derivation for time dilation is in the form I am familiar with as v increas t'/to decreases, time dilation I understand. Two different equations for the same thing cannot be right?

    I don't solve problems with SR, I have never needed to but still I try to undersand. Can someone help resolve this apparant problem.
  2. jcsd
  3. Aug 27, 2009 #2


    User Avatar
    Science Advisor

    They are both using the same formula, but different conventions for variable names. In the first page t' is the time on the moving ship for a stationary observer, and t is the observer's own time.

    On the second page, T is the time of a tick on Zoe's clock as Jasper observes it, and T' is the time of a tick on the same clock, as Zoe sees it herself.

    Thus the prime is used differently on the two pages. In the first page t' is time on a clock moving wrt to the observer; and on the second T' is the time on the observer's own clock.

    Cheers -- sylas
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook