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A light wave is emitted from the accretion disk surrounding a black hole and moves toward the hole ...

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A light wave is emitted from the accretion disk surrounding a black hole and moves toward the hole ...

A light wave is emitted from the accretion disk surrounding a black hole and moves toward the hole and away from an observer. This observer will see
A)   the beam of light moving faster than c as it accelerates toward the hole.
B)   the beam of light slow down and stop as it reaches the event horizon.
C)   that the wavelength of the light is gravitationally blueshifted and Doppler redshifted, and the two effects just cancel as the light reaches the event horizon.
D)   that the wavelength of the light is gravitationally blueshifted as it falls toward the event horizon.

Textbook

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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