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Hi All,

An observer, F, stands on Earth. A spaceship, F', is also on Earth. Their clocks are set at 0. The spaceship then leaves earth at .5c. After 10 seconds, F sends a light signal to F'. As soon as F' receives the signal, F' sends a light signal back. When does F receive this signal from F'?

When F sends a signal to F', the distance light has to travel is different for F and F'. Could I calculate this distance using .5c x 10 seconds, if I want to say in F's time frame? Then I could divide it by c to get the time light needs to travel to F'.

If so, I can just double this time to get the time F gets the signal from F', assuming F' responds instantly? Does this mean I can calculate all time it takes for all these events just staying in F's frame?

An observer, F, stands on Earth. A spaceship, F', is also on Earth. Their clocks are set at 0. The spaceship then leaves earth at .5c. After 10 seconds, F sends a light signal to F'. As soon as F' receives the signal, F' sends a light signal back. When does F receive this signal from F'?

When F sends a signal to F', the distance light has to travel is different for F and F'. Could I calculate this distance using .5c x 10 seconds, if I want to say in F's time frame? Then I could divide it by c to get the time light needs to travel to F'.

If so, I can just double this time to get the time F gets the signal from F', assuming F' responds instantly? Does this mean I can calculate all time it takes for all these events just staying in F's frame?