R2B.9 Suppose you are in an inertial frame in empty space with a clock, a telesc

Question

R2B.9 Suppose you are in an inertial frame in empty space with a clock, a telescope, and a powerful strobe light. A friend is sitting in the same frame at a very large (unknown) distance from your clock. At precisely 12:00:00 noon according to your clock, you set off the strobe lamp. Precisely 30.0 s later, you see in your telescope the face of your friend's clock illuminated by your strobe flash (a) How far away is your friend from you (in seconds)? (b) What should you see on the face of your friend's clock if that clock is synchronized with yours? Describe your reasoning in a few short sentences

Explanation / Answer

a] d = vt = 30 light seconds = 3e8*30 = 9*10^9 m

b] We see 12:00:00

It is because, we have got the image which was 30s ago because light from my friend took 30 s to reach me.

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