On the interpretation of the redshift in a static gravitational field

The classical phenomenon of the redshift of light in a static gravitational potential, usually called the gravitational redshift, is described in the literature essentially in two ways: On the one hand, the phenomenon is expl ained through the behavior of clocks which run faster the higher they are l ocated in the potential, whereas the energy and frequency of the propagatin g photon do not change with height. The light thus appears to be redshifted relative to the frequency of the clock. On the other hand, the phenomenon is alternatively discussed (even in some authoritative texts) in terms of a n energy loss of a photon as it overcomes the gravitational attraction of t he massive body. This second approach operates with notions such as the "gr avitational mass" or the "potential energy" of a photon and we assert that it is misleading. We do not claim to present any original ideas or to give a comprehensive review of the subject. our goal being essentially a pedagog ical American Association of Physics Teachers.