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The change in the wavelength of electromagnetic radiation in a gravitational field predicted by general relativity.
A heuristic Newtonian derivation gives
where  is the shifted wavelength,  is the rest wavelength, h is Planck's constant,
c is the speed of light,  is the rest energy, E is the shifted energy, m is a fictional "mass" of
photon (which is subsequently canceled out), G is the gravitational constant, and r is the distance from the
gravitating body with mass M.
 Mössbauer Effect, Relativistic Redshift
© 1996-2007 Eric W. Weisstein
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