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As photons reach a black hole and begin fall in - is their speed increased as they go down (like a vacuum cleaner does to dust).

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marked as duplicate by Kyle Kanos, Brandon Enright, John Rennie, Jimnosperm, Qmechanic Apr 3 '14 at 19:21

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Possible duplicates: physics.stackexchange.com/q/24319/2451 , physics.stackexchange.com/q/98980/2451 , and links therein. –  Qmechanic Apr 2 '14 at 20:29
Also, photons travel at the speed of light, thus their speeds cannot increase. –  Kyle Kanos Apr 3 '14 at 0:52