Einsteinian physics: The speed of light falling in gravity DECREASES:
"The change in speed of light with change in height is dc/dh=g/c."
https://www.youtube.com/watch?v=FJ2SVPahBzg
"Contrary to intuition, the speed of light (properly defined) decreases as the black hole is approached. [...] If the photon, the 'particle' of light, is thought of as behaving like a massive object, it would indeed be accelerated to higher speeds as it
falls toward a black hole. However, the photon has no mass and so behaves in a manner that is not intuitively obvious."
http://www.physlink.com/Education/AskExperts/ae13.cfm
"Simply put: Light appears to travel slower near bigger mass (in stronger gravitational fields)."
https://speed-of-light.com/speed_of_light_gravity.html
"Thus, as φ becomes increasingly negative (i.e., as the magnitude of the potential increases), the radial "speed of light" c_r defined in terms of the Schwarzschild parameters t and r is reduced to less than the nominal value of c."
https://www.
mathpages.com/rr/s6-01/6-01.htm
Newtonian physics: The speed of light falling in gravity INCREASES. This is so obvious that physicists often admit it explicitly, ignoring for a while Divine Albert's Divine Theory:
James Hartle, Gravity: An Introduction to Einstein's General Relativity, p. 113: "Light falls in a gravitational field with the same acceleration as material bodies."
https://www.amazon.com/Gravity-Introduction-Einsteins-General-Relativity/dp/0805386629
"We conclude, therefore, that A BEAM OF LIGHT WILL ACCELERATE IN A GRAVITATIONAL FIELD AS DO OBJECTS WITH REST MASS. For example, near the surface of Earth light will fall with acceleration 9.8 m/s^2."
http://web.pdx.edu/~pmoeck/books/Tipler_Llewellyn.pdf
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."
https://courses.physics.illinois.edu/phys419/sp2011/
lectures/Lecture13/L13r.html
Albert Einstein Institute: "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..."
http://www.einstein-online.info/spotlights/redshift_white_dwarfs.html
R. V. Pound and J. L. Snider, Effect of Gravity on Gamma Radiation: "It is not our purpose here to enter into the many-sided discussion of the relationship between the effect under study and general relativity or energy conservation. It is to be noted
that no strictly relativistic concepts are involved and the description of the effect as an "apparent weight" of photons is suggestive. The velocity difference predicted is identical to that which a material object would acquire in free fall for a time
equal to the time of flight."
http://virgo.lal.in2p3.fr/NPAC/relativite_fichiers/pound.pdf
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