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← ScienceWhich 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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