Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 26 - Think and Solve: 35

Answer

500 s, which is about 8.3 min. 1000 s, which is less than Ole Roemer's determination of 1300 s.

Work Step by Step

If c denotes the speed of light, then $d = 1.5 \times 10^{11} m = ct$. Solve for t = d/c. $$\frac{1.5 \times 10^{11} m }{300,000,000 m/s} = 500 s$$ The time for light to cross the diameter of the Earth’s orbit is twice that number, or 1000 s. Ole Roemer got reasonably close (question 33).
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