Answer
The ratio is the speed of light. What's special is that all observers will measure the same speed for light, no matter how they are moving relative to the source of light.
Work Step by Step
This is discussed on page 664.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 35 - Reading Check Questions (Comprehension) - Page 682: 11
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