Moving clock as seen by an observer at rest

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  • Thread starter samirgaliz
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  • #26
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What you describe is a single event.
Not each single event for a observer, but integrated information of multiple events from the observers reveals slowness of the clock.

We do not have to hire many observers Should synchronized clocks be set everywhere, an observer can see the clock in the rocket also see the clock set there and compare them. He see the rocket now and then and find various time differences that show the slowness of the clock in the rocket.
 
  • #27
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He will think that his clock is wrong since physically he observes the radioactive material decays in a time "to"!!
As well as the term mass, when we refer decay time, the material should be at rest. The moving radioactive material has another (prolonged) value of decay time.
 
  • #28
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Thank you everyone! things are much clearer to me now.
 
  • #29
phinds
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As well as the term mass, when we refer decay time, the material should be at rest. The moving radioactive material has another (prolonged) value of decay time.
What do you mean it should be at rest? EVERYTHING is at rest in one frame and everything is moving in another frame.
 
  • #30
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We should choose the frame where referred body is at rest and measure decay time in that frame. Thus observed value is "decay time".
 
  • #31
Mister T
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We should choose the frame where referred body is at rest and measure decay time in that frame. Thus observed value is "decay time".
More generally, it's called the proper time. It's the time that elapses between two events that occur at the same place. It's equal to the interval between the events, and is a relativistic invariant.
 
  • #32
your simple act of distinguishing between "see" and "calculate" was immensely helpful and answered a question I had pondered for a long time. Thank you.
 
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