This text unwittingly lays the foundations of an Einstein-free physics:
University of Illinois at Urbana-Champaign: "Consider a falling object. Its speed increases as it is falling. Hence, if we were to associate a frequency with that object the frequency should increase accordingly as it falls to earth. Because of the
equivalence between gravitational and inertial mass, we should observe the same effect for light. So lets shine a light beam from the top of a very tall building. If we can measure the frequency shift as the light beam descends the building, we should be
able to discern how gravity affects a falling light beam. This was done by Pound and Rebka in 1960. They shone a light from the top of the Jefferson tower at Harvard and measured the frequency shift. The frequency shift was tiny but in agreement with the
theoretical prediction."
https://courses.physics.illinois.edu/phys419/sp2011/lectures/Lecture13/L13r.html
Two principles implied in this particular scenario are actually valid in any scenario:
1. Any frequency shift is caused by a proportional speed-of-light shift.
2. The wavelength of light is invariable.
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Pentcho Valev
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