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The twin Paradox

  1. Feb 18, 2006 #1
    Guys can anybody explain me the famous "Twin Paradox"
    --->Sampath
     
  2. jcsd
  3. Feb 18, 2006 #2

    jtbell

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    Staff: Mentor

    There have been many discussions of the twin paradox here. Have you tried searching for them?

    I think you will be more likely to get helpful results if you first find some explanation/discussion of the twin paradox here or elsewhere on the Web. For example, you might start here:

    http://math.ucr.edu/home/baez/physics/Relativity/SR/TwinParadox/twin_paradox.html

    After reading it and trying to understand it, ask specific questions.

    Most people are more likely to respond to specific, focused questions that they can answer briefly, instead of broad questions that require a whole chapter of a textbook in response. Especially a topic like this one, which has been discussed many times. People get tired of repeating themselves.
     
    Last edited: Feb 18, 2006
  4. Feb 18, 2006 #3
    Thanks for the reply
    Sam.
     
  5. Feb 18, 2006 #4
    Is it possible to explain the twin paradox without assuming that
    * The laws of physics are the same in all inertial reference frames
    * The speed of light is always the same regardless of reference frame
    Please reply
    Sampath
     
  6. Feb 18, 2006 #5
    Is it possible to explain the twin paradox
    without assuming that
    * The laws of physics are the same in all inertial reference frames
    * The speed of light is always the same regardless of reference frame
     
  7. Feb 18, 2006 #6

    Hurkyl

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    Gold Member

    The twin paradox itself makes those assumptions.

    So, I have no clue how one could possibly make sense out of your question.
     
  8. Feb 18, 2006 #7

    jtbell

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    Staff: Mentor

    Your question is equivalent to "Is it possible to explain the twin paradox without using special relativity?" Without special relativity the twin paradox does not arise at all. Therefore, the answer to your question must be "no".
     
  9. Feb 19, 2006 #8
    time dilation

    please explain clearly
     
  10. Feb 19, 2006 #9
    time dilation

    can you explain, what is time dilation? and give it's general formula.
     
  11. Feb 20, 2006 #10
    i get it.
    thanks
    Sampath.
     
  12. Feb 20, 2006 #11
    sylvan
    this is in reply regarding time dilation

    Time Dilation ---> A moving clock ticks more slowly than a clock at rest.

    Measurements of time intervals are affected by relative motion b/w an observer andwhat is observed. As a result the a clock that moves w.r.t an observer ticks more slowly than it does when it does without such motion and therefore such processes occur more slowly to an observer when they take place in a different inertial frame.

    Explanation:-
    Consider a time interval of t_0 b/w any two events in a space craft. We on the ground would find that the same interval has a longertime duration t. t_0 is determined by the events that occur at the same place in the observers reference frame , this is called proper time of the interval, but when witnessed from the ground , the events that mark the begining and the end of the time interval appear longer than the proper time and this is called ' Time Dilation " .

    the formula is:
    time dilation(t) = t_0/sqrt(1-(v2/c2))
    i.e.., t_0 by sqrt of (1-(vsquare/csquare)) .

    where
    t_0 = time interval on clock at rest relative to an observer = proper time
    t = time interval on clock in motion relative to an observer
    v = speed of relative motion
    c = speed of light

    Sampath.
     
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