Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 37 - Relativity - Questions - Page 1144: 6a

Answer

Sally

Work Step by Step

Sally is actually on the spaceship itself and so she in the same inertial reference frame as the ship when she measures the time; therefore Sally's measurement is the proper time. Sam, who is on earth, will record a longer length of time due to the effects of time dilation.
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