Richard Feynman and Newton's Emission Theory of Light
Richard P. Feynman, "QED: The strange theory of light and matter", Princeton University Press, 1985, p. 15: "I want to emphasize that light comes in this form - particles. It is very important to know that light behaves like particles, especially for those of you who have gone to school, where you probably learned something about light behaving like waves. I'm telling you the way it does behave - like particles."
Richard Feynman: "A photon of frequency w_0 has the energy E_0 = hw_0. Since the energy E_0 has the relativistic mass E_0/c^2 the photon has a mass (not rest mass) hw_0/c^2, and is "attracted" by the earth. In falling the distance H it will gain an additional energy (hw_0/c^2)gH, so it arrives with the energy E = hw_0(1+gH/c^2). But its frequency after the fall is E/h, giving again the result in Eq. (42.5). Our ideas about relativity, quantum physics, and energy conservation all fit together only if Einstein's predictions about clocks in a gravitational field are right. The frequency changes we are talking about are normally very small. For instance, for an altitude difference of 20 meters at the earth's surface the frequency difference is only about two parts in 10^15. However, just such a change has recently been found experimentally using the Mössbauer effect. [R. V. Pound and G. A. Rebka, Jr., Physical Review Letters Vol. 4, p. 337 (1960)]. Einstein was perfectly correct."
Einstein was not "perfectly correct" - essentially (and implicitly), Feynman confirms Newton's emission theory of light (which says that the speed of photons falling in a gravitational field varies like the speed of ordinary falling objects) and refutes Einstein's relativity. Other authoritative confirmations:
Albert Einstein: "A large body of facts shows undeniably that light has certain fundamental properties that are better explained by Newton's emission theory of light than by the oscillation theory."
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. Consider a light beam that is travelling away from a gravitational field. Its frequency should shift to lower values. This is known as the gravitational red shift of light."
Albert Einstein Institute: "One of the three classical tests for general relativity is the gravitational redshift of light or other forms of electromagnetic radiation. However, in contrast to the other two tests - the gravitational deflection of light and the relativistic perihelion shift -, you do not need general relativity to derive the correct prediction for the gravitational redshift. A combination of Newtonian gravity, a particle theory of light, and the weak equivalence principle (gravitating mass equals inertial mass) suffices. (...) The gravitational redshift was first measured on earth in 1960-65 by Pound, Rebka, and Snider at Harvard University..."
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