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Which effect causes observed frequency shift as light escapes gravity?

A)Gravitational redshift via equivalence principle
B)Doppler shift from frame dragging
C)Cosmological expansion via Hubble's law
D)Refraction due to spacetime curvature

💡 Explanation

Gravitational redshift occurs because the equivalence principle dictates gravity bends spacetime, therefore photons lose energy climbing out of a gravitational well, rather than Doppler shift which requires relative motion.

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