A Light Wave Is Emitted from the Accretion Disk Surrounding

question 164

Multiple Choice

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.

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