1. Oct 16, 2013 #1

   Superposed_Cat

   

   Hi all, I was wondering if, when a beam of light is pulled towards a black hole , because it can't accelerate, it is blueshifted? Thanks in advance.

    

   Superposed_Cat, Oct 16, 2013
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3. Oct 16, 2013 #2

   tiny-tim

   

   Science Advisor

   Homework Helper

   Hi Superposed_Cat!
   
   If two people with identical flashlights are stationary at the top and bottom of a mountain, shining the flashlights at each other,
   
   the top person will see the light redshifted, and the bottom person will see the light blueshifted.
   
   It's the same for stationary observers near a black hole …
   
   the gravitational effect of a black hole is (outside the event horizon and outside the surface of the star) exactly the same as that of a star of the same mass.

    

   tiny-tim, Oct 16, 2013
4. Oct 16, 2013 #3

   Superposed_Cat

   

   Thanks tiny-tim :). Good day fine sir.

    

   Superposed_Cat, Oct 16, 2013

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