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ghwellsjr
#5
Jan15-11, 12:18 AM
PF Gold
P: 4,745
Quote Quote by senorhosh View Post
Ie: let's say physicist wants to set up an experiment.
He is in the train and attaches flashlights in the front and back of the train. They are timed to go on at the EXACT SAME TIME. The physicist knows this and waits. Then he sees the front light before he can see the back light.
This is not correct. This physicist on the moving train will see the two flashes at the same time (assuming he's in the middle of the train). But a physicist on the ground will see the two flashes at different times. Which one is right?

And if the physicist on the ground set up a similar experiment, he would see both flashes at the same time while the physicist on the moving train would see them at different times. Which one is right? Does that make any difference to your understanding of Eisntein's traig experiment.