Answer
Choice C.
Work Step by Step
The proper time interval is measured by observers at rest with respect to the flashlight. This is the measurement of 0.87 s.
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 26 - The Special Theory of Relativity - Misconceptual Questions - Page 766: 3
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