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Re: [Phys-l] Inertia? - Reprise

David,
Thanks. Looking at the light deflection solution in Adler, et al, Intro. to GR, the null geodesic path is the key. It doesn't depend on the photon energy (or freq or wavelength), but on how the big mass (star) curves the spacetime.

Bill

"David Bowman" <David_Bowman@georgetowncollege.edu> 11/15/2008 1:14 am >>>
<snip>All photons, regardless of frequency & energy, have zero mass.
They don't have any "effective" mass either, whatever that means.
<snip>
But these test particles are massless, and as such,
only follow *null* geodesics.
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