Re: Rest mass

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#7417

From: Sam Wormley
Date: Sat, 14 Jul 2007 06:47

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Pentcho Valev wrote:

> 
> Does the speed of photons vary with the gravitational potential, as
> the speed of other particles does, and, equivalently, does the speed
> of photons vary with the relative speed of the light source and the
> observer, as the speed of other particles does?
> 

   Photons propagate at c independent of relative velocity between source
   and observer.

   However--See Shapiro Effect
   Consider the time delay of signal passing between the earth and Mars
   due to the curvature of space time by the Sun. Then

     delta T_max = (4G M/c^3)*[ln(4 r_mars r_earth/r_sun^2) +1 ]

   http://www.geocities.com/newastronomy/animate.htm

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Subject: Re: Rest mass
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