Conceptual Physics (12th Edition)

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

Chapter 36 - Think and Explain - Page 698-699: 43


The unfortunate astronaut falling into the black hole would see the rest of the universe blue-shifted.

Work Step by Step

The energy of a photon is given by E = hf, where h is Planck's constant. The energy of incoming light is increased, because it is falling into the gravitational well of the black hole, so the frequency is raised (the light is blue-shifted).
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