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Problem 2.7: Which of the following is true for all relative velocities?

select a relative velocity, u/c:

Please wait for the animation to completely load.

You can view the events in either the green reference frame or the red reference frame.

Two measuring sticks pass close by each other with relative speeds comparable to the speed of light (position is given in meters and time is given in seconds).  A light flash occurs when the right ends of the sticks coincide, event 1, and again when the left ends coincide, event 2.  Which of the following is true for all relative velocities?  Restart.

  1. There is a unique speed when the events are simultaneous in both reference frames.
  2. Event 1 always occurs before event 2.
  3. At a given speed, both the red and green observers will always agree on which event occurred first.
  4. None of the above.
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