# Light & Time

1. Sep 29, 2010

### pavi_elex

There is a very very big space-ship in which light takes 1 second to reach from one corner to other corner.
if two signals are sent one after other,what will be the amount of time for second signal to reach other corner?

If space ship is traveling with uniform acceleration(very high for our world but very less than speed of light).
If space ship is traveling with uniform velocity (very high for our world but very less than speed of light).

Please do not answer in numbers, the data is not sufficient for calculation. Please just describe time in detail for first signal (sending end & receiving end both) and second signal(sending end & receiving end both).

2. Sep 29, 2010

### HallsofIvy

You just said one second didn't you?

What is "very less than the speed of light"? Grammatically it would be the acceleration but you cannot compare acceleration with velocity. By the "equivalence principle" an acceleration is equivalent to a local gravitational field. The light would move in a curved path and the time would depend upon the length of the path which would depend on the acceleration.

At uniform velocity, the entire ship is at rest with respect to its own coordinate frame so the answer is the same as initially- one second because you said "2(1- \frac{1}{2^{p+1}})[/tex]"