Answer
neither
Work Step by Step
In this case, neither of them will record the proper time of the signal. The proper time would have to be recorded by something in the same inertial reference frame as the pulse of light itself.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 37 - Relativity - Questions - Page 1144: 6b
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