Re: Rest mass

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#7419

From: BURT
Date: Sat, 14 Jul 2007 07:23

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On Jul 13, 11:47 pm, Sam Wormley <sworml...@mchsi.com> wrote:
> 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

Photons move at light speed in a contracted metric.

Burt Schwarzkauf

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From:  BURT <macromitch@yahoo.com>
Newsgroups: sci.physics.relativity,sci.physics,sci.philosophy.tech,sci.astro,fr.sci.physique
Subject: Re: Rest mass
Date: Sat, 14 Jul 2007 00:23:37 -0700
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