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Which gravitational consequence on photon energy arises because of the equivalence principle implemented within precise GPS satellite clocks at higher altitudes?

A)Blueshift towards increased photon frequency
B)No overall relative detectable frequency shift
C)Increased speed exceeds speed of light
D)Redshift towards decreased photon frequency

💡 Explanation

Gravitational redshift causes lower frequency photons as they lose energy escaping the gravitational well, because spacetime is dilated. Therefore, GPS satellite clocks require correction for time dilation effects experienced, rather than blue shift due to motion.

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