- #1
Heatherfield
- 22
- 0
I've studied SR previously and, after a lot of work, grew to understand it. Now I have to re-work through it using a different textbook and can't figure out the deal with time dillation.
I derived the equation
T = T0γ
With relative ease. In this equation, T0 is measured by a person at rest (in his own frame) while T is measured by a person moving (in the rest frame of the first observer. Due to the nature of γ, T will always be larger than T0.
At this point, my textbook states that this means that the observer at rest observes time slowing down for the moving person. I don't understand this.
Say a spaceship was passing by Earth. I'm laying in the grass, looking up. In my frame, I'm at rest. The spaceship passes over, quickly. I measure the time I can see it. Since I'm at rest in my own frame, this time is T0.
The same chain of events could be measured from the spaceship. Staying in my frame, my equation tells me that the spaceship measures a higher time. Perhaps I measured 4 seconds, while the spaceship measured 8!
In other words, more time passed for the ship. Doesn't that mean that I observe a spaceship where time is moving much faster! After all, I "saw" twice as much as time passing on their clocks than on mine!
I derived the equation
T = T0γ
With relative ease. In this equation, T0 is measured by a person at rest (in his own frame) while T is measured by a person moving (in the rest frame of the first observer. Due to the nature of γ, T will always be larger than T0.
At this point, my textbook states that this means that the observer at rest observes time slowing down for the moving person. I don't understand this.
Say a spaceship was passing by Earth. I'm laying in the grass, looking up. In my frame, I'm at rest. The spaceship passes over, quickly. I measure the time I can see it. Since I'm at rest in my own frame, this time is T0.
The same chain of events could be measured from the spaceship. Staying in my frame, my equation tells me that the spaceship measures a higher time. Perhaps I measured 4 seconds, while the spaceship measured 8!
In other words, more time passed for the ship. Doesn't that mean that I observe a spaceship where time is moving much faster! After all, I "saw" twice as much as time passing on their clocks than on mine!